FOOD AND HEALTH 1
Answer Key
Possible answer(s:
1. I like healthy foods such as nuts, fruits, and
vegetables. I relly like unhealthy foods like
cake and chocolate, too!
2. I think people ate healthier in the past because
less sugar was used. It might have been too
expensive for people to buy processed foods
in the past, but now processed foods are often
cheaper than organic foods.
1A SWEET LOVE
Answer Key
Before You Read
A1.c2b;3.d4. e:5. a .
B. Possible answerls): Sugar tastes great and
people have gotten used to its taste. The first
paragraph of the reading text states that it is
because sugar is an addictive drug.
Reading Comprehension
A1.a2.c3. c4. b(Para D):5. c (ParaQ
B.1. High blood pressure (Para B); 2. To replace
taste (Para D); 3. Healthier options; fruit (Para日)
Reading Skill
A1.a2.a3.b .
B.1. avoid sugar becauseit' s in so mary foods;
2. are fighting back against sugar with
healthier options.
Critical Thinking
Possible answer(s: juice. water. pizza,
hamburgers, pasta, rice, vegetables, fruit,
eggs, fries. steak, chicken, bread, ice cream
Possible answer(s: I should probably cut
down on juice and ice cream. I learned that
some foods like bread can actually have a lot
of sugar, too.
Vocabulary Practice
A 1. drug; 2. recommended; 3. addiction
B. 1. buy; 2. wasting time or energy; 3. angry a
4. classrooms; 5. easy: 6. keep it 7. less
C.1. off, 2. up:3. in
1B FOOD FOR THE FUTURE
Answer Key
Before You Read
A1.b;2.a3.c
B. Possible answers: People are worried that
certain plant species will disappear. Maybe
they want to protect the seeds of vegetables
so there will always be food.
Reading Comprehension
A1.b;2.a;3.a(Para D);4. b(Para );:5.b
B.1.b:2c3.a4.d5.e
Reading Skill
A1.a2.b:3.b;4.b;5. b
B. Possible answer(s: 1. to describe a situation
or problem; 2. to report data as figures
or statistics, 3. to provide background
information; 4. to descibe a situation or
problem; 5. to offer or describe a solution / to
present a concusion
Vocabulary Practice
A 1. varieties; 2. continents; 3. scale; 4. historic
5. crop
B.1.j:2. g;3.h;4.t5. b;6.e;7.c8. d;9.t
10.a
C. 1. wide; 2. strong; 3. high
VIDEO SPACE FOOD 25
Answer Key
Before You Watch
A 1. many; 2. long it lasts; 3. do not fall
B. Possible answer(s: Space food needs to
be easy to hold. It can' t have too many
parts to it like a sandwich; otherwise,
the dfferent parts will all float in dfferent
directions! The food also needs to be
nutritious so that they can still have a
balanced diet on the limited variety of
food they can carry to the space station.
While You Watch
B.1.It’s lighter. It doesn' t need to be stored in
a fridge. 2. Very rarely. 3. An Italian astronaut
said he missed his favorite food.
CALL OF THE WILD 2
Answer Key
Possible answer(s):
1. The wolf is howling as a way to communicate.
This wolf could be howling to show its
location, to warn other wolves about danger,
or to say that prey is nearby.
2. Animals communicate with sounds, body
language, and movements.
2A SONG OF THE HUMPBACK
Answer Key
Before You Read
A 1. often; 2. small fish; 3. making sounds
B. Students should scan the article to check
answers to activity A.
Reading Comprehension
A1.b;2.a (Para D);3. a;4.c(Para E):5. b
B.1.c2.a;3.b;4.d
Reading Skill
A1.a2a3. b
B.1. the whale' s voice; 2. Douglas Chadwick;
3. the humpback 4. the humpback
(a dfferent whale from 3)
Crtical Thinking
In paragraph D, the author says that the
reasons are unknown. However, one theory is
that males want to let other males know they
are in the area.
Possible answer(s): Whales might
communicate to be social, to point out food
or danger, or to ask for help.
Vocabulary Practice
A 1. single; 2. aware: 3. Apparently;
4. experience; 5. record
B.1. complex; 2. season; 3. unknown;
4. interact; 5. curious
C.1. view; 2. national; 3. action
2B THE 1.000-VEAR BIRD SONG
Answer Key
Before You Read
A The great horned owl and the lyrebird
communicate in interesting ways. The owl
uses a great variety of different calls to
communicate very specfc things. The lyrebird
can copy other birds'
sounds and even mimic
man- made sounds like car alarms!
B. The bird in the passage is the swamp sparrow.
Its call is very special because it has been
passed down between generations for
possibly 1,000 years.
Reading Comprehension
A 1.c2. a;3. a (Para E):4. b (Para E);
5.c
B.1. T (Para B;2. T (Para C; 3.F (Para D);
4. NG;5. T (Para G)
Reading Skill
A 1. place: North America' s wetlands (Para A);
2. name: Robert Lachlan (Para B). Andrew
Farnsworth (Para G); 3. date: 2008 -2009
(Para D); 4. number: 615 (Para D);: 5. reason:
to break each song up into sllables (Para D)
B.1. F (cities, roads, plantations); 2. E allows
the birds to create traditions that last for
centuries, the song-types in the marshes of
North America today may well have been
there 1.000 years ago); 3. G (scientists may
be able to identity how other animals are
able to preserve their cultural traditions;
4. B (like humans, baby swamp sparrows learn
to communicate by copying adults.)
Critical Thinking
Possible answer(s: A celebrity might change his
or her hairstyle, and suddenly everyone wants
the same style. A new smartphone is released,
and everyone wants to have it A new word to
mean "very good" becomes popular, and soon it
is part of everyone" s vocabulary.
Vocabulary Practice
A 1. humans; 2. aspect 3. standard;
4. exchange; 5. evolved
B.1. b;2.a3.e:4.c5.d
C.1. combine; creation; evolution
2. a combination; b. evolution; C create:
d. Evolves
VIDEO THE LION" s ROAR
Answer Key
Before You Watch
A1.a2.c3. b
B.1. tiger, 2. a pride; 3. female; 4. Africa, Asia
While You Watch
B.1. when they are one year old; 2 females;
3.10.000; 4. Asiatic
Critical Thinking
Possible answer(s): Humpback whales don 't
always sing the same song. A lyrebird can
mimic man-made noises. A swamp sparrow
learns its song from aduts. A parrot can
change its call to match a new tune. A lion' s
roar is about as loud as a clap of thunder.
Possible answer(s: I would like to study how
crickets communicate. I often hear them
chirping outside in the summer, and I think
they might rub their back legs together to
make that noise. I wonder if they do that to
communicate with one another.
HISTORY DETECTIVES 3
Answer Key
Possible answer(s:
1. Scientists learn about the past from witten
records and physical remains such as the
ruins of buildings, equipment, or personal
possessions that have survived.
2.I‘ ve visited Machu Picchu in Peru and saw
the ancient city.I ve also visited Pompeii in
Italy and saw old buildings, roads, and even
paintings on the walls!
3A WAS KING TUT MURDERED?
Answer Key
Before You Read
A1.d;2.b;3.c4.a
B. Theories include murder, an injury from war
or a hunting accident, and an infection from a
leg fracture.
Reading Comprehension
A 1.c(Para E)2.c (Para D);3. C4 b (Para B);
5. a (Para E)
B. 1. King Tut' 5 tomb; 2 the mummy, 3. the hole
in the skull; 4. King Tut; 5. King Tut' s parents;
6. Hawass and his team
Reading Skill
Aa,Para E; b. Para A:c Para A:d. Para B;
e. page 41 (in the caption); f. Para A
g. Para D; h. Para C
B.fb,c.e,d.h,ga
Citica Thinking
Possible answer(s): I don' t think it is important
that we find out how King Tut died because it
happened thousands of years ago. I suppose
some people are interested in the mystery, but I
think archeologists should use their time now to
make new discoveries instead.
Vocabulary Practice
A 1. offer; 2. infection; 3. analyze; 4. effective;
5. murder; 6. attached
B.1. injury: 2. conducted; 3. took control of:
4. cause
C.1. Possible answer(s: The ofler of $500
was too low. I could not offer any help.
2. Possible answers: The murder took place
over 300 years ago. She wanted to murder
her husband for revenge.
3B WHO KILLED THE ICEMAN?
Answer Key
Before You Read
A 1. He was not young., and he was probably an
important and wealthy man.2. He was klled
in the Ottal Alps over 5,300 years ago. He
was klled by an injury from a stone arrow that
hit him from behind.
Reading Comprehension
A 1.c (Para G):2. a (Para B); 3. b (Para E)x;
4.c(Para FR;5.a
B.e,ab,d.c
Reading Skill
A 1. Para A;2. Para A:3. Para B;4. Para F;
5. ParaF;6. ParaF;7. ParaG; 8. Para G;
9. Para G; 10. Para G
B.1. F;2. F;3. s (believe);4. F;5. F;
6. S (probably;: 7. S (Perhaps);8. F:
9. S (More likely); 10. S (He may have thought)
Critical Thinking
3. He carried a copper改which was valuable.
He may have been a local leader. 6. He had
injuries on this hand and head. There was
blood of four other people on his clothes.
7. Because his injuries had started to heal, the
fight probably happened some time before his
death. 9. He had eaten a big meal, so he
must have been resting. 10. He wouldn' t have
stopped to eat unless he thought he was safe.
Possible answer(s: Each claim is supported
with details and evidence, so I think these are
very possible explanations .
Vocabulary Practice
A 1. likely; 2. indicate; 3. frozen; 4. enable
B.1. attacked; 2 leader; 3. beneath; 4. chased;
5. fled; 6. cruel
C.1. act 2. death; 3. trick 4. comment
VIDEO WALKING WITH GIANTS
Answer Key
Before You Watch
A1.c2b;3.a .
B. Possible answer(s): The Rapa Nui could
have used tree trunks and ropes to drag the
statues.
While You Watch
A1.d;2.c3. b;4.a;5.e
B.1.b:2a3.b
Critical Thinking
Possible answer(s): The 2011 theory is supported
by the fact that the bottoms of the statues were
not flat. The approach was also tested by a team
and was successful. However, in my opinion there
is not enough evidence to fully prove the theory.
TRADITIONS AND RITUALS 4
Answer Key
Possible answer($):
1. Thanksgiving, Independence Day, St Patrick s
Day
2. My favorite tradition is Thanksgiving because
my extended farmily comes over and we all eat
together.
4A LVING TREASURES
Answer Key
Before You Read
A 1. Possible answer(s: Great Barrier Reef in
Australia, Angkor Wat in Cambodia, Rapa
Nui National Park on Easter Island, Great
Wall of China, Statue of Liberty in the United
States,; 2. Possible answer($): These places
are rich in culture or history. They are natural
environments that must be protected.
B.b
Reading Comprehension
A1.c2c3. b (Para B):4. b (Para E);5. b(Para F)
B.1.c2a3.d4. b;5. a6.d7.c
Reading Skill
A cuisine (Para D); martial art (Para Q: ritual
(Para E); roots (Para G); veil (Para日)
B.1.e2d3.a4.b;5.c
Critical Thinking
Possible answer(s: Cuisine: rice and beans;
Performing Arts: dance contest; Crats:
handwoven baskets; Cultural Events: mask
ceremony
Possible answer(s: Handwoven baskets from
my country should be included on UNESCO' s list
because my people have been making them for
generations. We use local materials to make the
baskets, and it takes years to learn the slill
Vocabulary Practice
A 1. ceremony: 2. wrap: 3. symbols;
4. approves; 5. wedding
B.1. site; 2. diverse; crafts; 3. identity;
4. promote
C.1. make a start on it; 2. rise to a higher leve;
3. have success with it
4B THE CHANGING FACE OF KUNG FU
Answer Key
Before You Read
A 1. monk; 2. Acrobatics, 3. temple; 4. master
B.1. b;2.a3.c
Reading Comprehension
A 1. b(Para );2a (Para 8):3. c4.a5.c
B.1.F;2 NG; 3. NG;4.F;5. NG; 6. T
Reading Skill
A Paragraph A: a. S, b. M: Paragraph B: a. M.
b. S; Paragraph Ca s, b. M; Paragraph D:
a. s, b. M; ParagraphF;a S. b. M
Critical Thinking
Possible answer(s: In the past, children used
to wear traditional dothing for their 15th
birthday party.
Possible answer(s): Children today wear the
latest fashion from a department store. Idon' t
think this change is for the better because
young people don' t experience the cultural
aspect of dressing in a traditional way.
Vocabulary Practice
A 1. inspired; 2. basis; 3. series; 4. convinced;
5. ensured
B.1.don' tforget2. "Yes, please." ; .
3. hurt or kll; 4. atract; 5. high
C.1. rich; 2 able; 3. large
VIDEO DRAGON BOAT FESTIVAL
Answer Key
Before You Watch
A 1. move; 2. regularly; 3. very
While You Watch
Aab,e .
B.1. F (the longest dragon boats can be
35 meters);2. T;3. NG;4. NG;5. T
Critical Thinking
Possible answer(s: Festival name: Machu
Picchu Day; Purpose: the discovery of the
ancient cit; When: July 24: Activities: dress up
in traditional clothing and eat traditinal food;
Reason: to recognize the ancient people who
lived in our country
FINDING WONDERS 5
Answer Key
Possible answer(s):
1. Objects that are buried underground are
interesting because they may have been there
for hundreds or even thousands of years.
These objects can tell us a lot about the past.
2. The land might have been covered in forests. It
may even have been submerged underwater.
5A THE SECRETS IN THE SAND
Answer Key
Before You Read
A 1. extinct; 2. creatures; 3. beach; 4. skeleton;
5. museums
B. Possible answer(s: Mary Anning is remembered
today because her findings taught people more
about extinct animals and what life on Earth
was like millions of years ago.
Reading Comprehension
A1. b;2.a (Para B);3. b (Para C); 4. c (Para C);
5.b
B.1810: 5; 1811: 3; 1823: 2: 1828: 1; 1839: 4
Reading Skill
Aa,d;B.1a,b.ce2.c
Critical Thinking
Possible answer(s: She discovered the first
extinct animal known to science (Para B); She
discovered one of the first examples of a flying
creature that disappeared millions of years ago
(Para C); Her finds are displayed in museums in
London and Paris (ParaE).
Vocabulary Practice
A 1. extraordinary; 2. credit; 3. noticed;
4. continue; 5. displayed; 6. major
B.1. needs to pay back; 2 help with it
3. is able; 4. particular position
C. Posible answeris: The rescue of the small
boy was difcult / They were able to rescue
the baby bird as it fell from the tree; Put the
valuables in a hidden spot / She' s easy to spot
because of her red hair; It was a miraculous
find. /Ican' t find my shoes!
5B THE STORIES IN THE ROCKS
Answer Key
Before You Read
A 1. expedition; 2. predators; 3. paleontologists
B. Possible answer(s: Jom Hurum and Mary Anning
both look(ed) for fssis They both made new
discoveries. They both work(ed) near the sea.
Reading Comprehension
A 1. a2.a (Para B);3. C (Para C):4.c (Para D):
5. c (Para F
B.1. by hand (Para E); 2. in his bedroom
(ParaA):3. the "dig season" (Para C); 4. food,
jackhammers, water (Para D)
Reading kill
A 1. prehistoric, Possible answer(s: before recent
history; 2 collection, Possible answerls): process
of collecting; 3. scientists, Possible answeris:
people who study science; 4. soften, Possible
answer(s: cause to be soft
B.1. unlike, Possible answer(s): Unlike Hurum,
Anning lived in England; 2. unusual, Possible
answer(s). It' S unusual to have warm weather
in the winter, 3. hunter, Possible answer(s):
The wolf is an expert hunter; 4. visitors,
Possible answer($: There are many visitors to
the Jurassic Coast.
Vocabulary Practice
A 1. entire: 2. eventually: 3. productive;
4. cllection; 5. individual; 6. access
B.1. preparation; 2. remote; 3. remove;
4. softens
C.1. provide; 2. gain; 3. denied
VIDEO DIGGING INTO THE PAST
Answer Key
Before You Watch
A 1. in the sea; 2. like; 3.a lot of
B. Paleontologist bones; dig out dinosaurs
While You Watch
B.1.b:2.a3. a4. b
Crtical Thinking
Possible answer(s: a map of Svalbard, a
medical kit. a jackhammer, a small radio, a
magnifying glass; I think a map of Svalbard
would be the most important thing because
without it, we won' t know where to find the
best fossils.
REEF ENCOUNTERS 6.
Answer Key
Possible answer(s):
1. Coral reefs are endangered. About 25 percent
of the ocean" s animals live in coral reefs. They
can be very colorful. Some famous reefs include
the Great Barrier Reef in Australia.
2. Damage has been caused by numerous kinds
of pollution, by overfishing. and by physically
hurting coral reefs and the ocean floor. In
adition, global warming is having a negative
effect on marine habitats.
6A CITIES BENEATH THE SEA
Answer Key
Before You Read
A 1. T; 2. F (Coral polyps are a type of animal);
3. F (A coral reef usually gets larger over
time);4. T
B. how coral reefs are formed; coral reef wildlife;
problems affecting reefs
Reading Comprehension
A 1.c2a (Para B):3.b (ParaE);4. a;5.c
B.1. not counted; 2. full of color; 3. build again
Reading Skill
A.Not all reefs begin naturally For example,an
ocean current may encounter a man-made
object, like a sunken shipAs a result, the
water around the ship may become rich with
tiny animals called plankton A lot of small
fish gather there to feed on the plankton.]
Consequently, larger animals are attracted
o the ship Becausethe ship has many Ittle
openings.many creatures also have a place
to hide In time, the ship becomes covered in
polypsAs a result, soon, it no longer looks
like a ship at all
B.1. Effects: Water becomes rich in plankton.
2. Effects: Larger animals are attracted to
the ship.3. Causes: The ship has many ltte
openings. 4. Causes: The ship becomes
covered in polyps. Efects: It no longer looks
like a ship.
Critical Thinking
Possible answer(s:
1 think there should be a ban on all fishing
near coral reefs so that there isn' t overfishing
and the populations can rise. But then the fish
population might get too big. and the local
people won' t be able to sell fish.
1 think tourists shouldn' t be alowed to
dive near reefs. But tourism brings in a
lot of money and people should have the
opportunity to see all the sea creatures in their
natural habitat.
People should be banned from slling coral
products because they shouldn' t remove coral
from the reefs. But the local people make
money by slling coral.
People should start a campaign to raise
awareness by printing leaflets and handing
them out locally. That will cost a lot of
money. Plus, there are plenty of campaigns
that already exist, and the reefs still aren' t
protected.
Vocabulary Practice
A 1. negative; 2. shallow; 3. remarkable;
4. conservation
B. 1. don' t keep; 2. build; 3. stay; 4. dirty,
5. bright; 6. science lab
C. 1. meaning; 2. response; 3. effect; 4. thoughts
6B THE TRUTH ABOUT GREAT WHITES
Answer Key
Before You Read
A 1. F (Only one-third of shark attacks are said
to be from great white sharks.);
2. F (Great whites rarely kill their victimsJ;
3. T;4.T
Reading Comprehension
A 1.c2a (ParaA;3. c4.a5.c
B.1.c2d;3. a
Reading Skill
A 1. despite; 2. though; 3. However,
4. Even though
B.1. Even though great white sharks are
dangerous, they rarely kill humans 2. Great
white sharks are often seen off the coast of
Australia. However. suring is popular there.
Critical Thinking
Possible answer(s): Great white sharks don' t
see well and they think humans are seals
or sea lions. Great white sharks might just
be curious and are using their mouths to
investigate.
Possible answer(s): I think the author thinks
that the most likely explanation is that great
whites are curious and are using their mouths
to investigate. The author thinks this because
the reading passage ends with this idea.
Vocabulary Practice
A 1. victims; 2. confusion; 3. horror; .
4. inaccurate; 5. bite
B. 1. flow; 2. frightening: 3. tempting; 4. force;
5. gather
C.1. complete; 2. correct; 3. expensive
VIDEO OCEAN MEGABULDERS
Answer Key
Before You Watch
A1.b;2.d:3. a4.c
B.1. warm; 2. polyps; 3. limestone
While You Watch
B. 1. basketball; 2 largest; 3. 2.000;4. 25;
5. dimate; 6. 500; 7. the end of the
21st century
Critical Thinking
Possible answer(s:
how coral reefs are formed: The video was a
better source for this because 1 could see a clear
visual example in the video footage.
the threats facing coral reefs. The reading
passage was better because it contained more
details like ilegal fishing and water pllution.
DOLLARS AND SCENTS 7
Answer Key
Possible answer(s:
1. rose, daisy, lily, tulip, sunflower, iris, pansy,
orchid, daffodil, morning glory, lac, jasmine,
hydrangea
2. I think roses are the most beautiful flower. 1
also think they have the most beautiful scent.
7A THE FLOWER TRADE
Answer Key
Before You Read
A1.d;2.b;3. a4.c
B. the Netherlands, Ecuador, Colombia, the
United States
Reading Comprehension
A1.c2c (Para B):3. b;4.a, 5.a
B.1. high-tech cooling systems; 2. vase life;
3. 20 mllin; 4. independent rose grower
Reading Skill
A the Netherlands: b, d; Both: a;
Ecuador.ce, f .
B. hybrid tea: large, single flower on stem;
can grow to more than 2 meters tll;
Both: sell in large numbers; common garden
plant; foribunda: groups of flowers on stem,
short, less than 1 meter tall
Vocabulary Practice
A 1. industry, 2. considerable; 3. prevents;
4. exported; 5. handle
B.1. a2. a;3.b;4.b;5.a
C.1. valuable; 2. enjoyable; 3. likeable/ikable;
4. noticeable
7B THE POWER OF PERFUME
Answer Key
Before You Read
A1.b;2.a3.c
B. Possible answerlsk: They show celebrities in
their advertisements to make people want to
buy the perfume. They design bottles that have
attractive colors and evoke certain moods.
Reading Comprehension
A 1. a2c(Para C):3. a4. b (Para ):
5. a (Para G)
B.1. emotions; 2. memories; 3. smartly;
4. bottles; 5. celebrities
Reading Skill
A aroma, scent
B. negative
C.1. display; 2. popular; 3. cost
Critical Thinking
Possible answer(s: Target customer. female,
aged 20-30; Name of perfume or cologne:
Success; Bottle shape / color. slim light-blue
bottle; Celebrity: Keira Knightley, Other
marketing ideas: ads show female professional
at the ffice and relaxing at home with friends,
to focus on the fact that she is successful at
work and at home.
Vocabulary Practice
A 1. obtain; 2. distictive; 3. budget 4. profits;
5. derived
B.1.a2.b;3. b;4.a5.a
C.1. smell; 2 pattern; 3. feature
VIDEO FLOWERS FROM ECUADOR
Answer Key
Before You Watch
A1.a2.c3. b
B.1. Possible answer(s): The climate is almost
perfect for growing flowers. (Para D)
2. The roses have large heads and long,
straight stems.
While You Watch
A1.c2.b;3.a
B.1.100; 2.25; 3.6000;4.50
Critical Thinking
Possible answer(5): Buying from a small
company helps support local businesses, but it
would be more expensive than buying from an
international company. Buying from a mediumsize
company based overseas means that you
may not be able to see the flowers in person
before buying them. However, they are cheap,
and the company operates by fair trade rules.
Buying from a large company may be cheaper
than buying from a local one, but the flower
quality is not as good.
GREAT EXPLORERS 8
Answer Key
Possible answer(s:
1. Marco Polo (traveling from Italy to China,
visiting Kublai Khan); Christopher Columbus
(sailing to the Americasl); Ferdinand Magellan
(expedition to the East Indies and journeyed
around the Earth); Zheng He (establishing
Chinese trade).
2. They might explore the ocean floor, remote
jungles where few humans live (such as parts
of the Amazon rain forest and Indonesian
jungles), and even outer space.
8A AN INCREDIBLE JOURNEY
Answer Key
Before You Read
A 1. Marco Polo started and finished his trip in
Venice. They took three and a half years to
travel to China and stayed there for 17 years.
They took roughly another three and a half
years to journey to Venice, so they traveled
for 24 years.2. Singapore, Suzhou, Beijing,
Hangzhou; 3. He visited the Middle East,
Pakistan, India, and many parts of China.
Students' knowledge of the places will vary.
B. Possible answer(s): The Polos might have been
trying to earmn money or valuable materials
to sll. The passage tls us that Marco Polo
traveled to China to meet and work for the
powerful Mongol leader Kublai Khan.
Reading Comprehension
A 1. b;2. b (Para A); 3. c (Para D):4. c (Para D); .
5. a
B.te,d,b,ca
Reading Skill
A 1. teenager, 2.9.000; 3. 17; 4. Kublai Khan;
5. Europeans; 6. Beiing: 7. messaging;
8. paper; 9. book
Critical Thinking
Possible answer(s: I think Marco Polo gained
more from the visit to Kublai Khan because he
learned so much about technology and different
ways of doing things.
Vocabulary Practice
A 1. objective; 2. perceive; 3. observations;
4. permission; 5. informal
B.1. voyage; 2. journal; 3. undertake; 4. admire;
5. considered
C.1. admirable; 2 observe; 3. observations;
4. admirer
8B THE TRAVELS OF IBN BATTUTA
Answer Key
Before You Read
A Guesses will vary. Actual answers are:
1. Ibn Battuta; 2. He traveled through
44 modern countries; 3. 29 -30 years
Reading Comprehension
A 1. b;2.a(Para D); 3. a;4.c (Para E);:
5. c (Para B)
B.1. Paris; 2. a square, hotel, cafe;
3. several years; 4. a sudden storm
Reading Skill
A 1. Mecca; 2. some parts of the world;
3.29- 30;4. 44: 5. India; 6. Deht; 7. ships;
8. belongings
Crtical Thinking
Possible answer(s: Mahatma Gandhi (1869-
1948); Christopher Columbus (1451-1506);
Confucius (551- 479 BC)
Vocabulary Practice
A 1. regarded; 2. intention; 3. misfortunes;
4. prior
B.1. translated; 2. financed; 3. consented;
4. wisdom; 5. abandoned; 6. belongings
C.1. spelled; 2. placed; 3. behaved; 4. heard
VIDEO THE LEGEND OF MARCO POLO
Answer Key
Before You Watch
A1.d;2.c3. b;4.a
B. Possible answer(s): One of the reasons
historians don' t believe Polo acully visited
China is that already-existing timelines don' t
match Marco Polo' s records, and that puts the
information he provided in doubt.
While You Watch
A b fellow prisonern; c (1271 AD);
e (vast halls)
B. a. A (1268); b. A (fish with fun;c F (coal;
d. F (summer palace)
Critical Thinking
Possible answer(s: 1 think that the argument
is stronger that Marco Polo did wisit China.
His book has a lot of specific details that
could not have been made up. Also, when
writing his record of the battle, it s possible
that he didn' t know exactly what year it was,
especally if he had been traveling for such a
long time.
Possible answer(s: I think the reading is
written as fact, so the author must believe
that Marco Polo really did visit China.
IDENTITY 9
Answer Key
Possible answer(s:
1. I am similar to my mother because we have
the same color hair and we are both shortI m
like my dad because we both have blue eyes.
2. When I was young, I had blond hair and was
very skinny. Now my hair is dark andT ve
put on a lot of weight! I used to love sports,
and now I don' t really do much anymore. My
interests have changed a lot over the years.
9A THE TEENAGE BRAIN
Answer Key
Before You Read
A1.c2a3. b
B. Possible answer(s: I think a person' s brain
probably finishes developing by the time
they are 17 or 18. (Actual answer. Our brains
continue to change until age 25.)
Reading Comprehension
A1.b;2.b(Para B):3. b;4.a;5a
B. 1. brain-imaging; 2. sic 3. computer system;
4.25; 5. adult;
6. wide circle; 7. parents' care
Reading Skill
A 1. Recently, scientits discovered that though
our brains are almost at their full size by the
age of six they are far from fully developed.
(Para B) 2. Now, scientists have concluded that
our brains continue to change until age 25.
(Para B) 3. However, a sill developing brain
does this clumsily. The result, scientists claim, is
the unpredictable behavior seen in teenagers.
(Para B) 4. The studies confirm that teens are
more likely to take risks and behave in extreme
ways. (Para Q 5. Researchers believe this makes
the rewards seem more important than the
risks, and makes teens feel the excitement of
new experiences more keenly than adults do.
(Para D) 6. The scientists' findings suggest that
in the long run, the impulses of the teen brain
are what help teens leave their parents’care
and live their own lives sucesstully. (Para F)
B.1. discovered, H; 2 concluded, H; 3. claim, L;
4. confim, H; 5. believe, L; 6. suggest, L
Critical Thinking
Possible answer(s: Someone in their 30s will
probably take fewer risks because they will be
more aware of their responsibilities. For example,
someone with children might be less likely to go
slydving or travel to a dangerous place than a
teenager because they feel responsible for their
children. They would feel like they need to be
safe so that they can continue to provide for
their children.
Vocabulary Practice
A 1. risk; 2. realize; 3. rewards; 4. deal with;
5. concluded
B.1.bx2.b:3.a4.a5.a
C. go over = review; go on = continue;
go for = choose; go ahead = start
9B SEEING DOUBLE
Answer Key
Before You Read
A 1. in common; 2.1Q: 3. identiat 4. genes
B. They looked alike. They were both the same
height and weight. They had the same smile
and voice. Also, they both had named their
dogs Toy, both had maried and divorced
women named Linda, both had had the same
job (sherifD，"enjoyed making things with
wood, " both got bad headaches, and both
liked to leave love notes for their wives.
Reading Comprehension
A1.b;2.a (Para A):3. c;4.a (Para D):5.c
B.1.d2e;3.c4.b;5. a
Reading kill
A 1. Yes;2. No;3. Yes4. No; 5. Yes
B. Possible answer(s): 1. probably not;
2. probably, 3. probably, 4. probably
Crtical Thinking
Possible answer(): 1. Studies like this are not very
common because there probably aren' t many
sets of older twins that have been separated.
2. They probably grew up in dfferent environments
because the artide makes a point to say that
environment might not play such a big role in
similarities after al 3. Geneticists probably
often study identical twins because their DNA
is the same.4. The similarities were probably
coincidences because things like the dogs" name
and the wives' name do not have anything to do
with genetics.
Vocabulary Practice
A 1. adopted; 2. admitted; 3. apart
4. coincidences; 5. Raised
B. 1. others in your family; 2. a lot; 3. edges;
4. married; 5. work
C. 1. problem; 2. injuries 3. weather,
4. headache
VIDEO THE GLOBAL VILLAGE
Answer Key
Before You Watch
A 1. Possible answer(s); People in my country
might have originally come from Africa.
2. Possible answers: Some benefits could
be lerning more about genetic diseases and
making more medical discoveries to improve
our quality of lite.
While You Watch
A 1. their ancestors came from; 2. back
3. Africa
B.1. the Americas; 2. Europe; 3. East & South
Asia; 4. the Middle East 5. Africa
Critical Thinking
Possible answer(s: 1 learned that the human
race is genetically one big family, and so the
problems humans have with getting along are
similar to the problems any family experiences.
It is surprising to think that we all have the same
genetic roots.
FACNG CHANGE 10
Answer Key
Possible answer(s:
1. I think areas near the Arctic Circle are the
most afected by climate change because the
ice is melting at an increasingly faster rate.
2.r ve noticed that the summers are hoter and
the winters are colder where I live. Storms are
getting stronger, too.
10A THE BIG THAW
Answer Key
Before You Read
A 1.1960, 2014; 2. 1.5 degrees Fahrenheit
(0.83 degrees Celsius): 3. Antarctica,
15 degrees Fahrenheit
B. Chacaltaya (Bolivia), North and South Poles,
Arctic Ocean, Greenland, Jakobshavn Isbrae,
Antarctica, the Himalayas, the Andes, India,
Bangladesh, Peru; The Arctic Ocean and
Greenland have seen the greatest rise in
temperature.
Reading Comprehension
A1.b;2.b;3. a (Para D);4. b(ParaF:5. a
B.b>c>a>d>e
Reading Skill
A 1. Ten years ago, scientits warned that the
Arctic Ocean could lose all its ice in about
a hundred years. Now, they think it could
happen much sooner. 2. In fact, the glacier
is mowing twice as fast as it was in 1995.
3. For instance, water from melting ice runs
down cracks in the surface and gets between
the ice and rock below. 4. If the ice sheet of
Antarctica continues to melt at its current
rate, the next few centuries could see at least
a two-meter rise in sea levels, forcing tens of
millions of people out of their homes.
5. An increasing number of heat waves and
droughts worldwide also suggests global
warming is having an impact on humans right
now, and that it could change the face of the
world in the future. 6. "We need to vote for
leaders who understand the serious issues
impacting our climate," he says. "There is no
issue this important- -because the future of
the planet is at stake."
B. Possible answer(s): I don' t think the author
provided enough supporting information in
Question 1. The author mentioned human
activity" but did not give any concrete
examples of what humans have done to cause
the problem.
Crtical Thinking
Possible answer(s: 1. When we eat or drink
sugary foods, the sugar enters our blood and
affects the parts of our brain that make us
feel good. 2. "Sugar, we believe, is one of
the culprits, if not the major culprit" says
Johnson. 3. From breakfast cereals to afterdinner
desserts, our foods are increasingly flled
with it. 4. Many schools are replacing sugary
desserts with healthier options, like fruit
Possible answer(s: 1. I think this is very well
supported because the passage says the sugar
affects parts of our brain that make us feel
good, then the feeling goes away, which leaves
us wanting more. That sounds like the science
behind an addiction. 2. I don' t think this is
well supported because there is no evidence
that sugar causes high blood pressure and
diabetes. The passage simply states it as fact.
3. I think this is well supported because the
passage says sugar is found in everything
from breakfast cereals to after-dinner desserts.
Sugar is also used to replace taste in foods
with low fat. 4. I think this is well supported
because the passage says schools are serving
healthier options, growing their own food, and
providing ways for students to exercise more.
Vocabulary Practice
A 1. absorbs; 2. consequence; 3. tring
4. critical
B.1. thin line; 2. surprise; 3. changes;
4. smoothly; 5. provide the failities; 6. more
C.1. gradual; 2. sudden; 3. major, 4. slight
10B LIFE ON THE EDGE
Answer Key
Before You Read
A 1. in Greenland; Possible answeris:It' s a
small town of about 1.000 people. 2 It's an
island in the summer, In the winter, the water
freezes and it' s no longer an island. 3. Possible
answer(s: One effect of dimate change is that
sea levels are rising because the ice is melting,
B. Possible answer(s: I read that ice loss has
shortened the hunting season, so people in
Uummannaq are losing money.
Reading Comprehension
A1.a2.a(Para A;3. b;4. a;5. b
B.1.b(ParaB):2.e(ParaD);3.c(ParaE):
4.a(Para E):5. d (Para B)
Reading kill
A D,E
B.1. isolated; 2. government; 3. hunting;
4. fishing; 5. job opportunities; 6. city; 7. Inuit
hunting culture; 8. (sustainable) future
Critical Thinking
Possible answer(s: I think the argument
against is stronger because I think people
need to change with the times. Greenland is
very dfferent today than it was before, and
people need to find new ways to earn a living,
Possible answer(s: If I were a young resident
of Uummannaq, I would leave because I
would not want to be so isolated from the
rest of the world.
Vocabulary Practice
A 1. goverment; 2. appealed; 3. economic;
4. encouraged; 5. lfestyle; 6. give up
B.1.d2a3.b:4.c
C.1. take, 2. make; 3. show, 4. keep
VIDEO THE SLED DOGS OF GREENLAND
Answer Key
Before You Watch
A 1. costs; 2. need; 3. family that lived in the
past; 4. mountains and rivers
While You Watch
A 1. an old; 2. More; 3. only slightly; 4. the dogs
sometimes bite; 5. making new laws
B.1. fisherman, team, solid ice; 2. veterinarian,
need help, take better care
FACT OR FAKE? 11
Answer Key
Possible answer(s:
1. I think people believed that fairies existed
prior to the pictures, so they had an easy time
beliving the photos were real.
2. I once saw a photo of an alien that looked
real.
11A THE KNOWLEDGE ILLUSION
Answer Key
Before You Read
A Possible answer(s): The ball costs 5 cents.
(Correct) It costs 10 cents. (Incorrect)
B. Possible answer(s: I was not correct. The
answer is 5 cents.
C. Possible answers: Most people say what I
said: 10 cents. That is because most people
will give an intuitive response.
Reading Comprehension
A1. b;2.ax3. c4.c (Para E): 5.c (Para G)
B.1.F (Para D); 2. NG;3. T (Para E)4. NG
Reading Skill
A1.b;2. b;3.c
B. Possible answer(s: nature■(n) the basic
characteristics of something; train = (M to teach
a skill or behavior; face = (n) the surface or the
part you see
Vocabulary Practice
A 1. rely on; 2 concept 3. average; 4. norm;
5. encounter; 6. media
B.1.b;2.d3.a4.c
C.1. salary; 2. day; 3. family: 4. size
11B THE UIMITS OF LYING
Answer Key
Before You Read
A Possible answer(s):1 thinkit' s OK to tell
someone you like something about their
appearance even if you really don' t. I thinkit' s
OK to lie to make someone feel better.
B. b(Para C)
Reading Comprehension
A 1. b(Para A):2.c (Para C):3.c4.a5. b .
B.1.E2-:3. B;4.A5. D;6.C
Reading Skill
A 1. condusion; 2. results; 3. method;
4. purpose
B. Purpose. How do swamp sparrows learn
their song? Method: Researchers recorded
the calls of 615 male swamp sparrows and
used computer software to break each song
into notes. They measured the differences
between the tunes. Result: Only 2 percent
of male sparrows sang a dfferent song
from the standard tune. Conclusion: The
song types have probably been there for
1000 years.
Possible answer(s): The information in Reading
2B is presented in a dfferent way. The
conclusion comes first. In Reading 11B, the
order is presented in a linear way,
Critical Thinking
Possible answer(s): 1. The player might feel
this is a tactic that all players use. 2. The
worker might feel that he or she would
use that stationery at the office anyway, s0
there' s no harm in bringing it home.3. The
salesperson might feel that the customer
would buy the product somewhere else.
Possible answer(s;: Another example of common
dishonest behavior is a worker using the ffice
printer for printing personal documents. I think
this behavior can be justified because the worker
may think it does not cost much.
Vocabulary Practice
A 1. participate; 2. excuse; 3. honest
4. repot/reported; 5. lie
B.1.e2d:3.b:4.c5.a
C. 1. dishonest; 2. honesty, 3. dishonesty;
4. honest
VIDEO SMILE TRIAL
Answer Key
Before You Watch
A1.d;2.c3.b:4.a
B. Possible answer(s): I think the smile on the
right is the real one. She looks likeshe' s
laughing out loud here, whereas on the left
she looks like she' s just smiling for the camera.
While You Watch
B.1. Rea; 2. Real; 3. Fake; 4. Reat; 5. Fake
Critical Thinking
Possible answer(s): To show anger, people
lower their eyebrows and frown. To show
disappointment, people raise their eyebrows
and frown. To show surprise, people open
their mouth wide and raise their eyebrows. To
show joy, people open their mouth wide and
smile.
Possible answer(s: People might fake surprise
if, for example, they had found out abouta
surprise party but didn' t want to ruin it They
might fake joy if they received a gift they
don' tlike.
GOING TO EXTREMES 12
Answer Key
Possible answer(s:
1. Extreme places a person might want to visit
are high mountain peaks, deep caves, deep
areas of the ocean.
2. Some adventurous sports include skydiving,
BASE. jumping, caving, rock climbing,
mountain dlimbing, and backcountry sking.
I would like to try skydiving because I am not
afraid of heights, and it would make me feel
12A THE DREAM OF FLIGHT
Answer Key
Before You Read
A Possible answer(s): airplane, skydiving, hang
gliding, BASE jumping
B. flying machine, hang gliding, BASE jumping,
wings with small engines
Reading Comprehension
A1.c2b(Para D);3. b;4. b (Para F):5. b (Para G)
B.1.d:2.b:3.c4.f5. e .
Reading Skill
A1.d;2.a3. bx;4.t5.c6e
B. 1. a hang glider, 2. tandem flight
3. BASE jumpers; 4. fe-falling
Critical Thinking
Possible answer(s): skydiving, flying with a jetpowered
wing. BASE jumping. hang gliding,
flying in a small airplane. I think that the higher
a flyer goes, the more danger there is in getting
injured badly or dying. Hang gliding might be
considered the safest because gliders don' t fly at
great heights. BASE jumping might be considered
the most dangerous because it s at a low height.
Jumps happen from a height of less than
600 meters, which means that jumpers have
very ltte time to open their parachutes.
Vocabulary Practice
A 1. wings; 2. thil; 3. fantastic; 4. ciffs;
5. Unlike
B.1. dfficult 2. skydiving; 3. car; 4. hands;
5. want to do
C. Posible answeris: great, amazing, cool,
extraordinary, tremendous, trrific, huge,
monumental, phenomenal
12B DARK DESCENT
Answer Key
Before You Read
A1.b;2.a3.c .
B. squeeze = tight passage (Para C); sump= a
passage flled with water (Para D); pit= an
area of a cave that falls straight down (Para F)
Reading Comprehension
A1. b;2.c(Para E):3. c4.b(Para E);5.C
B.1.a2.c3.b;4.b;5.c6.a
Reading Skill
A 1. January 2001 2. sump: 3. supplies;
4. Millennium pit; 5. Game Over;
6. Gennady Samokhin
B.1994, 11.800 meters; 1976, 9.631 meters;
two years later; 9.973 meters; 1982,
85 meters; 12 years
Vocabulary Practice
A 1. blocks 2. nessit; 3. supplies 4. conquer,
5. out of time
B.1. relatively; 2. depth; 3. ease;
4. disappointed; 5. blocking; 6. emerged
C.1. gas; 2. necesity, 3. supplies; 4. choice
VIDEO SEA CAVES
Answer Key
Before You Watch
A1.a2.c3. b
B. Possible answer(s): I think Barth and his
colleagues learned more about the geology
of the area. They probably found many dlues
about the age of Matainaka Cave, and the
way in which it was formed.
While You Watch
A Possible answer(s): My idea about Barth
learning more about the geology of the area
was mentioned in the video. I saw that he
and his team found some impressive rock
formations. The team is also studying the
cave for evidence of past earthquakes and
tsunamis. They also found out that the cave
is about 80,000 years old and is getting 2 cm
deeper every year.
B.1.1.5;2.70;3.6;4. 80;5.2
Critical Thinking
Possible answer(s: Yves Rossy invented
experimental jet packs and has the nickname
of "Jetman." He even had to be registered as
an airplane in Britain in order to fly with his jet
pack. I think that his inventions are impressive
because they may lead to faster and more
innovative ways for an individual to travel.
