第1单元答案
开头
Answer Key
Answers will vary. Possible answers include:
1. Healthy foods may incude foods and dishes
made up mostly of whole foods (foods that
are not processed) such as fruits, vegetables,
meats, legumes, nuts, etc. 2. Unhealthy foods
may include processed foods, such as junk
food or fast food, or sweet desserts made with
a lot of sugar. 3. Because people eat so many
processed foods today, many people believe we
ate healthier food in the past when we only ate
whole foods.
1a
Answer Key
Before You Read
A.1.e;2.b:3.c:4.d;5.a
B. Students' answers may vary. The actual
answer is that sugar is an addictive drug.
Reading Comprehension
1.a;2. d; 3.c (ines 18-21); 4. a (paragraph 4);
5.c (lines 24-26); 6. d dines 29-30);7. d
Reading Skill
A.1.a;2.a;3.b;4. b;5. b
Answers will vary. Some may argue that if
sugar is addictive, then manufacturers have a
responsibility to prevent creating a population
of sugar addicts. However, others may argue
that a manufacturer only has a responsibility to
state on its product's label how much sugar is
contained in it, and that they are not responsible
for the health of people who then choose to
consume that product anyway.
Vocabulary Practice
A.1. drug; 2. recommend; 3. addicted
B.1.b;2.b;3.b;4.a;5.b;6.a;7.a
1b
Answer Key
Before You Read
A.1.d;2.c;3.b;4.a
B. Answers will vary, but students should
recognize that the topic is related to preserving
food crops and/or seeds that are disappearing
Reading Comprehension
1. b;2.c (lines2-3); 3. d (ine 10); 4. b (lines
14-17):5.a (lines 14-16); 6. b (lines 26-27);
7.c (lines 34-35)
Reading Skill
A.1.a;2.b:3.b;4.b:5.b;6. b
Critical Thinking
Answers will vary. It may be easier for some
to emotionally connect to saving endangered
animals because of the bond that humans
have with animals. Others may argue that
without food diversity, the human species may
eventually face extinction itself.
Vocabulary Practice
A.1. varieties; 2. continents; 3. -scale;
4. historic; 5. crop
B.1.j:2.g;3.h;4.a;5.b;6.e;7.c8.d;9.i10.f
结尾
Answer Key
Before You Watch
A.1. Syria; 2. Spain, Italy, Greece; 3. Answers
may vary. The Mediterranean region has a mild
climate with warm summers and cool winters.
There are only two seasons and the temperature
usually does not rise above 22"C (72*F) in the
summer.
While You Watch
A.1.T;2.T:3.F;4.T;5. F
After You Watch
A.1. the same tree; 2. fruit; 3. thousands;
4. black
B.1. Answers will vary. 2. Answers will vary.
3. Answers will vary. Possible answers include:
blueberries, almonds, Greek yogurt, flaxseeds,
shitake mushrooms, wild salmon, etc.
第二单元答案
开头
Answer Key
1. Answers will vary. The elephant is acting
playful with its caretaker, and both human and
animal appear to be happy. It's possible that
they are both thinking positive thoughts about
the other. 2. Animals communicate with sounds,
body language, and movements. 3. Answers will
vary. When humans and domesticated animals
live together for a long time, they often become
able to interpret each other's moods, thoughts,
and emotions as communicated through sound,
movement, and body language.
2A
Answer Key
Before You Read
A.1. often; 2. jumps out of; 3. catch fish;
4. singing
B. Students should scan the article to check
answers to Activity A.
Reading Comprehension
1. C; 2. b (lines 31-32);3. a (lines 24 -25);4. d
(line 38);5.C; 6. a;7. b (ines 18 and45- -46)
Reading Skill
A.1.a;2.a;3.b
B.1. the whale's voice; 2. Douglas Chadwick;
3. the humpback; 4. the humpback (a different
whale from 3)
Critical Thinking
Answers will vary. The author suggests the
males are competing with other males. In the
past, scientists thought the sounds were a
mating call for males to attract females. Because
whales in the same area all sing the same
song, and the songs change, (which means
the whales are composing them) perhaps they
sing simply because they enjoy it or in order to
communicate with each other.
Vocabulary Practice
A.1. single; 2. aware; 3. Apparently; 4. leap;
5. alarmed
B.1. complex; 2. season; 3. unknown;
4. interact; 5. curious
2B
Answer Key
Before You Read
A.1. From left to right, the types of dogs are:
German shepherd, mountain dog (possibly
a Cross with a shepherd), Staffordshire bull
terrier, English mastiff, mountain dog (possibly
Estrelan), Rat terrier
2. German shepherds are known to be good
working dogs and protectors; Rat terriers are
known for being able to kill rats and other
pests. 3. The German shepherd is often used
as a guard dog or police dog because they're
obedient and fierce. Rat terriers have been used
for pest control. 4. Answers will vary depending
on where a person lives and what kind of pet
they want, but good pets are usually friendly,
not aggressive, and easy to live with.
B. Wheaten terrier, carer; beagle, worker;
Yorkshire terrier, pampered
Reading Comprehension
1. C;2. b (paragraph 1); 3. d (lines 22-23);4. b
(line 38); 5. d (line 39); 6. a (caption and lines
13-14 and 20-24); 7.c (lines 46 -48)
Reading Skill
A.1. date/number, about 14,000 years ago
(line 2); 2. name, Shaynee (line 13); 3. reason,
They bring love and cheer to patients (lines
12-13); 4. place, in airports (ine 20); 5. name,
doga (line 38)
B.1.T (lines4-5);2. F (ine 15);3. T (ine 28);
4. T (line 45)
Critical Thinking
Answers will vary. Some other animals that have
a close relationship with humans incude horses,
cats, and birds. Other animals that are kept as
pets include: hamsters, guinea pigs, rabbits,
snakes, turtles, lizards, fish, etc.
Vocabulary Practice
A.1. luggage; 2. garbage; 3. track; 4. donated;
5. talents
B.1. rescue; 2. select; 3. obedient; 4. plenty;
5. affection
结尾
Answer Key
Before You Watch
1. husky; 2. Siberia, north Asia, the Arctic;
3. They help humans hunt and travel.
While You Watch
The following should be checked: examples of
dogs that help humans; a dog's sense of smell;
history of human partnership with dogs; theories
on why humans acquired dogs
After You Watch
A.1.c;2.b;3.a;4.c
B.1.e;2.d;3.b;4.c;5.a
C. Answers will vary. Students should support
their opinions with reasons and examples.
第三单元答案
开头
Answer Key
1. Scientists learn about the past from written
records and physical remains such as the ruins
of buildings, equipment, or personal possessions
that have survived, and sometimes human
bodies. 2. Ancient Egypt was a civilization along
the Nile River over 3,000 years ago. It is known
for its complex religion and language, and great
feats of architecture and art, Ancient Egypt was
ruled by a series of powerful pharaohs. The
pharaoh was both the political and religious
leader of the people. Over the course of its
civilization, Ancient Egypt had a number of
dynasties in power, or families who ruled for
years through hereditary succession. 3. Answers
will vany.
3A
Answer Key
Before You Read
A.1.d;2.b;3.c;4.a
B. Theories include murder, an injury from war
or a hunting accident, and an infection from a
leg fracture.
Reading Comprehension
1.c (lines 36-37, 46);2. d; 3. d dines 35- 36); 4.
d;5.c (ines 41-43); 6. a (line 39); 7. a (ine 38)
Reading Skill
A.a. line 38; b. line 2:C line 5; d. line 11;
e. page 41 (in the caption); f. line 3; g. line 32;
h. line 20
B. from left to right:f,b.c.e.d.h.g. a
Critical Thinking
Answers will vary. Students should support their
opinions with reasons.
Vocabulary Practice
A.1. conducted; 2. injury; 3. luxurious; 4. rule
out; 5. vulnerable
B.1. offer, 2. analyze; 3. effective; 4. murder;
5. attachment
3B
Answer Key
Before You Read
A. Predictions will vary. Actual answers are: 1.
He was not young, and he was probably an
important and wealthy man. (paragraph 2);
2. He was killed in the Otztal Alps over 5,300
years ago. (paragraph 1) He was klled by an
injury from a stone arrow that hit him from
behind. (paragraph 5)
B. Students should use the headings in the passage
to help them scan for the correct answers.
Reading Comprehension
1.b;2.c (lines3- -4); 3. d (line 10); 4. a (line 22);
5.c (lines 29-31); 6. d (lines 34-35); 7.a
Reading Skill
A.1. lines2-3;2. lines 45; 3. line 9; 4. lines
32 -33;5. line 34; 6. lines 35-36; 7. line 37;
8. lines 39- 40; 9. lines 41-42; 10. line 42
B.1.F;2. F;3. T (believe, line9);4.F;5. F;
6. T (unlikely, line 34; may mean, line 35); 7. T
(perhaps, line 37; scientists don't think so, line
41);8. F; 9. T (More likely, line 41); 10. T (may
have thought, line 42)
Critical Thinking
Answers will vary. Some ideas include: He had an
argument while eating dinner and ran away, and
then was chased and killed from behind; He was
hunting and another hunter accidentally injured
him with an arrow; He was at a meeting of
leaders and was assassinated on the way home.
Vocabulary Practice
A.1. debatable; 2. deduce; 3. frozen; 4. imply,
5. enable
B.1. cruel; 2. wealthy; 3. laborer, 4. indicates;
5. beneath
结尾
Answer Key
Before You Watch
A.1.a;2.c;3.b;4.d
B. Predictions will vary. Actual answer is: b
While You Watch
A. top row, left to right: 3, 1; bottom row, left to
right: 4, 2
After You Watch
A.1. T (believed to be); 2. T (according to
Reinhard, the Inca believed);3. F:;4. F
B. Answers will vary. Possible answers include:
1. The cold, frozen ground, and the ice on the
mountaintop.
2. Scientists can learn more about ancient
cultures and people, such as what people looked
like, what they wore, and perhaps some things
about their belief system.
3. Tut's body was carefully wrapped by
embalmers in ancient Egypt and his tomb
contained many sarcophaguses and coffins.
Otzi's body was preserved by the cold like the
girl, but he was not carefully buried like she was.
第四单元答案
开头
Answer Key
Answers will vary. Students should give
examples or details to support their answers.
4A
Answer Key
Before You Read
A. her wedding
B. b
Reading Comprehension
1.c;2.c 3. a (ines 11-12); 4. d (lines 19-20);
5.c (line 23);6. b (lines 26-27); 7. b (line 29)
Reading Slkill
A. nomad: lines 4, 30; drew: line 6; tagelmust:
lines 15, 17; warrior: line 16; jinns: lines 18, 27;
henna: line 19; ehan: line 21
B.1.a;2. g;3.b;4.c;5.f;6.e;7.d
Critical Thinking
Answers will vary. Assalama is 15 and Mohamed
is 25.
Vocabulary Practice
A.1. tents; 2. reserved; 3. ceremony; 4. wrap;
5. symbolize; 6. reunite; 7. weddings
B.1. jealous; 2. reserved; 3. reunite;
4. ceremony; 5. demonstrate; 6. approve
4B
Answer Key
Before You Read
A.1. monk; 2. Acrobatics; 3. temple; 4. master;
B. Predictions will vary, The actual answer is
that kung fu today often integrates acrobatics
and jumping. something not a part of traditional
kung fu, which is about disciplined fighting. not
entertainment.
Reading Comprehension
1.c (line 22);2. b (lines 5-7);3. b (lines 12-14);
4.d (lines 19-20):5.c;6.b;7.c
Reading Skill
A. Paragraph 1: a. S, b. M; Paragraph 2: a. M,
b. S; Paragraph3: a. S, b. M; Paragraph 4:a. S,
b. M; Paragraph 5:a.S, b. M
Critical Thinking
Answers will vary. Students should support
their opinions with reasons. Students may also
think about changes in traditional cuisines,
celebrations, and ways of dressing.
Vocabulary Practice
A.1. basis; 2. inspired; 3. series; 4. convinced;
5. ensure
B.1.a;2.a;3.b;4.a;5. a
结尾
Answer Key
Before You Watch
A.1. serpent; 2. Aborigines; 3. sites, 4. spirits;
5. (the) outback
While You Watch
A.1.T:2.F;3.T;4.F
After You Watch
A.1. only recently; 2. humans; 3. creator,
4. passed down through
B.1. Answers will vary. Possible answers include:
2. Answers will vary. Possible answers include:
She probably means that people must preserve
their culture by knowing. understanding,
and practicing it, and recognizing thatit is
an important part of their identity. Ways that
individuals can preserve a culture include:
learning traditions, such as dances, songs,
and stories, and participating in rituals and
ceremonies to showcase these traditions;
studying and using a native language that may
no longer be used outside of your community;
learning about the past from elders or teaching
it to younger people, etc. 3. Answers will vary.
第五单元答案
开头
Answer Key
Answers will vary, Students should support their
answers with examples and reasons. Possible
answers indude: 2. Subway lines, tunnels, walking
paths, and shopping centers. 3. Most people will
likely be comfortable with visiting established
underground areas of a city, such as shopping
areas or subways. Other areas, such as the tunnel
in the picture, may seem dangerous or dirty to
some, and an interesting adventure to others.
5A
Answer Key
Before You Read
A.1.c;2.e;3.a;4.b;5.d
B. Possible answers indude: have parties,
perform, create (art), explore, destroy
Reading Comprehension
1. b; 2. C (inferred from line 17 and entire
passage); 3. d (paragraph 2);4. b (line 21);
5.a (line 30); 6. b (inferred through context);
7. d (dlines 42-43)
Reading Skill
A. line 1: on a sidewalk, in the early morning;
line 2: of Paris, From a bakery; line 3: of fresh
bread, with long hair, line 4: on his head, from a
hole, in the sidewalk; line 5: by a young woman;
line 6; over the hole; line 7: down the street
B.1. on a sidewalk; 2. in the early morning;
3. on his head; 4. over the hole; 5. down the
street
Critical Thinking
Answers will vary. There may be dangers
underground. If someone got hurt, or if a crime
happened, it would be hard to get help. There
are many places of historical importance as well,
which careless explorers could disturb or destroy.
Vocabulary Practice
A.1. tunnels; 2. entrance; 3. permitted; 4. silent;
5. descend
B.1.a;2.b;3.a;4.b;5.a
5B
Answer Key
Before You Read
A.1. explosives; 2. sewage; 3. manholes
B. Predictions will vary. Actual answers are: what
lies beneath the streets of New York City, what
makes working under New York City dangerous
Reading Comprehension
1.c (ines2-4);2. d; 3.c (lines 24-25);4.c;5.a
(lines 26-28, 40);6. C; 7.d
Reading Skill
A.Looked up (into darkness) and down (into
deeper blackness),/then the elevator stoppeg/
and everyone got out
B. (With a group of 11 "sandhogs")- -the
nickname for the workers who build New York's
underground- -l boarded slow. shaky elevator
lit (by a single light bulb). (Slowly) we went
down a shaft dug (through 200 meters of rock).
Critical Thinking
Answers will vary. Jobs underground are
particularly dangerous because of the chance
of accidents, and the difculty of getting help
easily. The sandhogs use explosives in an
enclosed space, and often get injured. Other
dangerous jobs include: firefighting. deep-sea
fishing, mining. logging. farming. working with
chemicals or waste, and working in a factory
with dangerous equipment. Many dangerous
jobs are pald well, which is probably one reason
why people do them.
Vocabulary Practice
A.1. concrete; 2. board; 3. Experienced;
4. opportunity; 5. joked; 6. awful
B.1. slippery; 2. confident; 3. flowed;
4. drowned
结尾
Answer Key
Before You Watch
A. Answers will vary. Actual answers are: 1. Both
men dive into sewage to remove items that
are blocking the flow of wastewater; 2. Carlos
Barrios enjoys his job very much.
B. Predictions will vary.
While You Watch
A. human waste, chairs, cars, bodies, garbage,
dirty water, bones, dead animals
B. We see him take out a dead animal, garbage,
and an old iron wheel. He says "We take out
chairs, cars, bones, everything."
After You Watch
A.1.c;2.c;3.a;4.a;5.a !
B.1. Answers will vary, Possible answers include:
He must be careful and calm while doing his job
in order not to get hurt. He also must make sure
not to get cut because the water that he dives
in likely carries diseases. 2. Answers will vary.
3. Miner, butcher, charcoal maker, and bridge
painter.
第六单元答案
开头
Answer Key
1. Answers will vary, 2. Some fish (barracuda,
stonefish, lionfish, and scorpion fish), sharks,
stingrays, and jellyfish are dangerous, Some
corals sting as well. 3. Damage has been caused
by numerous kinds of pollution, by over-fishing,
and by physically hurting coral reefs and the
ocean floor. In addition, global warming is
having a negative effect on marine habitats.
6A
Answer Key
Before You Read
A.1.T;2.F:3.F;4.T
B. Predictions will vary. Actual answers are:
How coral reefs are formed; Coral reef wildlife;
Problems affecting reefs
Reading Comprehension
1.d;2.c (line 2);3. b (ine 16); 4. C;
5. b (lines30-31);6. d;7.c (lines 49-50)
Reading Skill
A. Not all reefs begin naturally. For example,
an ocean current may encounter a man-made
bject, Hike a sunken ship.As 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 planktonConsequently,
larger animals are attracted to the ship. Because
the ship has many Ittle openingmany creatures
also have a place to hide In time,the ship
' becomes covered in polyps.As a result, soon, it
no longer looks like a ship at all.
B.1. Effect: water becomes rich in plankton;
2. Effect: larger animals are attracted to the ship;
3. Cause: the ship has many openings, 4. Cause:
the ship becomes covered in polyps; Effect: it no
longer looks like a ship
Critical Thinking
Answers will vary.
Vocabulary Practice
A.1. negative; 2. shallow; 3. remarkable;
4. thrive; 5. conservation; 6. generations
B.1.b;2.a;3.b;4.b;5.a
6B
Answer Key
Before You Read
A.1. fish; 2. length; 3. teeth; 4. whales; 5. nets
B. Predictions will vary. Actual answers are:
Many people think that great whites are
aggressive animals who hunt and kill humans.
The truth is that they might just be curious
fish with poor eyesight who bite in order to
investigate.
Reading Comprehension
1. d; 2.a (lines 9-10); 3.c (lines 19-21); 4. d;
5.a;6.a (line 28);7. d
Reading Skill
A.1. Sharks are dangerous animals, yet many
people also think they're beautiful. 2. Although
seals and sea lions may look similar, they are
actually very different species. 3. Many people
think great whites are the biggest fish on Earth,
but whale sharks are much bigger. 4. Despite
many shark warning signs on that beach, people
still go swimming there.
Critical Thinking
Answers will vary. The author says that great
whites might just be curious and using their
mouths to investigate. Other theories presented
in the passage incude: Great whites don't see
well and think humans are seals or sea lions.
Vocabulary Practice
A.1. tempting; 2. arranged; 3. hypothesize;
4. gather, 5. categorizes
B.1. victims; 2. confusion; 3. horror,
4. inaccurate; 5. bite
结尾
Answer Key
Before You Watch
A.1.b;2.a;3.e;4.d;5.c
B. Predictions will vary, Actual answers are: 1. T;
2.F:3.T
While You Watch
A.1. Florida; 2. occasionally; 3. ban; 4. never;
5. "hit and run"
After You Watch
A.1.d;2.a;3.c;4.b
B. Answers will vary. Students should support
their answers with reasons and examples.
第七单元答案
开头
Answer Key
1, Answers will vary, Popular flower names
include: rose, daisy, lily, tulip, sunflower, iris,
pansy, orchid, daffodil, morning glory, lilac,
jasmine, hydrangea, etc. Note that in English,
flowers often have two names: common names
and botanical names in Latin. 2. Answers will
vary, Students should support their opinions
with reasons. 3. Possible answers include: as
decoration inside the home, as gifts, for religious
ceremonies, etc.
7A
Answer Key
Before You Read
A.1.d;2.b;3.a;4.c
B.b
Reading Comprehension
1.c (line 4);2. a (ines 13-14);3. b (line 18);
4.b;5.b (ines32-33);6. b (line 38); 7. a
Reading Skill
A. Roses: b (most popular in red); Both: a (nice
fragrance); Orchids: C (popular house plant)
B. Netherlands: b Cine 11), d (lines 9-10); Both:
f (ines 10, 33); Ecuador: a (line 30), C (ine 29)，
e (line 26)
Critical Thinking
Answers will vary. The international flower
industry continues to grow every year, and
may seem to be a good one to be involved in
from a business perspective. In growing and
transporting flowers, there are risks such as
weather-related problems or insect infestations
that could destroy a crop or a shipment
Vocabulary Practice
A.1. makes sense; 2. prevents, 3. exported;
4. handle
B.1.a;2.a;3.b;4.b;5.a;6.a
7B
Answer Key
Before You Read
A. Answers will vary. Students should support
their opinions with reasons and examples.
B. Derek Jeter is a sports celebrity who has his
own fragrance brand.
Reading Comprehension
1. a (line 5); 2. b (entire paragraph); 3. d (lines
13-14);4. a;5. C (lines 26 -27); 6. C (lines
24 -27); 7. a (line 35)
Reading Skill
A.1.a;2.c;3.b;4.c;5.a
B. Ina Paris cologne shop, a building of shining
stone, metal, and glass, well-known perfumes
are displayed and guarded like works of art in
the nearby Louvre Museum. Salespeople are
dressed stylishly in black, and every kind of
perfume is sold in a uniquely shaped bottle.
Critical Thinking
Answers will vary. Have students give examples
to support their ideas. Perfume ads often
present the ideas of beauty and attraction.
Vocabulary Practice
A.1. essences; 2. obtain; 3. distinctive;
4. budget; 5. derived
B.1.a;2.b;3.a;4.a:5. a
结尾
Answer Key
Before You Watch
A. Answers will vary. Students should support
their opinions with reasons and examples.
While You Watch
A.1. scents and tastes; 2. recreate the scents;
3. taste; 4. Only a few
After You Watch
A.1.F;2.T;3.F;4.T;5.T
B. Answers will vary. Students should support
their answers with reasons and examples.
第八单元答案
开头
Answer Key
1. Answers will vary. Some famous explorers are
Marco Polo, Ferdinand Magellan, and Zheng
He.2. The ocean floor remains to be explored
in many places, as well as remote jungles where
few humans live, such as parts of the Amazon
rainforest and Indonesian jungles. There is also
outer space to be explored. 3. Answers will vary,
Students should support their opinions with
reasons.
8A
Answer Key
Before You Read
A.1. Marco Polo started and finished his trip in
Venice. He 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. Predictions will vary. The passage tells us that
Marco Polo traveled to China to meet and work
for the powerful Mongol leader, Kublai Khan,
Reading Comprehension
1. b;2.b (line 7);3.C;4. C (line31);5. d;
6. C (lines42- 43 );7. b (ine 44)
Reading Skill
A. before: line 14; after; line 43; when; lines 3,
11, 13; as soon as: line 32; as: line 7; while:
lines 20, 42
B.1.2,1;2.2,1;3.1,1;4.1.1;5.1,2
Critical Thinking
Answers will vary. The reading focuses mainly
on what Marco Polo learned and brought back
to the West, instead of what China gained.
Vocabulary Practice
A.1. objective; 2. admire; 3. mineral;
4. undertake; 5. administration; 6. informal
B.1. voyage; 2. administration; 3. contributed;
4. journal; 5. admire; 6. perceived
8B
Answer Key
Before You Read
A. Guesses will vary. Actual answers are: 1. Ibn
Battuta; 2. He traveled through 44 modern
countries; 3.29 years
B. Students scan the first two paragraphs of the
passage to check their answers to A.
Reading Comprehension
1.c;2.c (line3);3.c;4. b (lines22- -23);5. C
(ine 29); 6. d (lines 31-32); 7. d (line 10)
Reading Skill
A.1. Returning; 2. Driven; 3. celebrated;
4. seeking; 5. Scattering
B.1. Leaving his friends behind, lbn Battuta
started traveling in 1325; 2. Known as Rihla, lbn
Battuta's book details his travels in Asia and Africa.
Critical Thinking
Answers will vary. Students should support their
opinions with reasons.
Vocabulary Practice
A.1. remote; 2. intention; 3. misfortunes;
4. prior; 5. unparalleled
B.1. translators; 2. financed; 3. consented;
4. wisdom; 5. abandoned
结尾
Answer Key
Before You Watch
A.1.d;2.c;3.b;4.a
While You Watch
A.1. inaccuracies; 2. battle; 3. fish;4. fur;
5. invented; 6. coal; 7.6,000; 8. buildings
After You Watch
A.1. When Marco Polo wrote his book, he
was in jail in Italy; 2. Marco Polo set off for
China from Venice in 1271 A.D.. traveling as a
merchant; 3. The Chinese call the Taklamakan
Desert the "desert of death"; 4. Marco Polo
claims he went to Shengdu, to Kublai Khan's
summer palace.
B. Answers will vary. Students should support
their answers with reasons and examples.
第九单元答案
开头
Answer Key
1. Answers will vary, Students should describe
themselves and support their answers with
examples.
9A
Answer Key
Before You Read
A.1. unfortunately; 2. prepare; 3. hunt for;
4. adolescence; 5. socialize
B. Predictions will vary. On line 15 of the
passage, it says that our brains continue to
change until age 25.
Reading Comprehension
1.c;2.d (lines 15-17);3. C (lines 22-23); 4. a;
5. d (lines 29-32); 6. d (lines 36-37); 7. a
Reading Skill
A. Students underline the claims. 1. lines 9-10;
2. line 15; 3. lines 17-18; 4. lines 20 21; 5. lines
27-29; 6. lines41-43
B.1. discovered, H; 2. conduded, H; 3. claim, L;
4. confirm, H; 5. believe, L; 6. suggest, L
Critical Thinking
Answers will vary. The passage talks about how
teenagers usually take more risks than adults,
and spend more time socializing with friends.
For teenagers, responsibilities usually revolve
around school and perhaps part-time jobs.
Otherwise, they rely on their parents to provide
them with life's necessities. This in turn keeps
them dependent on their parents. Adults are
able to live independently, but this comes with
heavier responsibilities. For most adults, this
includes having a full-time job, and learning
how to live without being dependent on
others. For adults who are married and/or have
children, taking care of their own families adds
to their responsibilities.
Vocabulary Practice
A.1. risk; 2. realize; 3. rewards; 4. intense;
5. deal with; 6. risks; 7. concluded
B.1.b;2.b;3. a;4.a;5.b;6. a
9B
Answer Key
Before You Read
A.1. in common; 2. influence; 3. IQ; 4. identical;
5. 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 married and divorced women named
Linda, both had had the same job (sherif) and
hobbies (carpentry), both got bad headaches,
and both liked to leave love notes for their wives.
Reading Comprehension
1.b;2.a (Cines2- -5);3.d (lines 13-14);4. a;
5.d (line 24);6. a (line 25); 7. d
Reading Skill
A.1. Yes; 2. No;3. Yes; 4. No;5. Yes
B.1.c;2. C
Critical Thinking
Answers will vary. Some twins find it hard to
establish themselves as individuals, especially
when young. Some may not like being seen
as a twin first and an individual second. For
parents, raising two children at once presents
many challenges. It is hard to find time to focus
on each child individually. There are likely many
sibling arguments to handle. Parents will also face
challenges in helping each child develop their
identify and interests apart from their sibling.
Plus, many items will have to be bought twice.
Vocabulary Practice
A.1. admitted; 2. adopted; 3. apart;
4. coincidences; 5. Raised
B.1.b;2.a;3.a;4.b;5.b;6. b
结尾
Answer Key
Before You Watch
A. Answers will vary. Actual answers are: 1. They
are standing in the countries of their closest
ancestors; 2. Students should support their
answers with examples; 3. We can learn about
human migration and genetic commonalities
between different peoples, and see that we are
actually all connected through our DNA.
While You Watch
A. The following should be checked: the
different groups people are divided into; the
continent where we all came from; where
humans have spent most of our history.
After You Watch
A.1.14,000, Europe; 2. Central Asia, 40,000;
3.45,000, the Middle East; 4. Africa, 60,000
B.1. Answers will vary. Students should support
their answers with reasons and examples; 2.
The speaker means that the human race is
genetically one big family, and so the problems
we have with getting along are similar to the
problems any family experiences.
第十单元答案
开头
Answer Key
1. Answers will vary, 2. The Arctic areas are the
most affected at present, but many parts of
the world are experiencing warmer and more
extreme weather conditions due to global
warming, 3. Glaciers and sea lice will melt, ocean
levels will rise and flood coastal cities, more
severe storms will occur, plants and animals will
have difficulty coping with a warmer environment
and some species will likely go extinct.
10A
Answer Key
Before You Read
A.1.7.79;2. 4.17; 3.2008
B. Chacaltaya, Jakobshavn lsbrae
Reading Comprehension
1.b;2.c; 3, a (lines 17-19); 4. b (line 30); 5. a
(line 32);6. C (lines 47- -48); 7. C (line 52)
Reading Skill
A.1.c (facts); 2. d (expert opinion);3. b
(examples or reasons); 4. a (common sense)
B. Students circle the following; 1. In fact (line
24); 2. Many scientists think line 39); 3. As a
result (ine 40); 4. As most would agree (ines
51-52)
Critical Thinking
Answers will vary depending on where students
are from. People can make changes to their
lifestyles, such as conserving energy. driving
less, wasting less water, recycling more, as well
as becoming more informed about the issue to
help change thinking. Goverments can make
stricter laws to limit greenhouse gas emissions,
from industrial sources especially, to lessen the
impact of global warming.
Vocabulary Practice
A.1. absorbs; 2. critical; 3. shift;
4. Consequences; 5. unexpected
B.1. host; 2. crack; 3. unstoppable; 4. slide;
5. exceed
10B
Answer Key
Before You Read
A.1. The walrus hunt in Greenland begins in
the Inglefield Fjord and continues to Baffin Bay
before returning to the fjord; 2. winter,
3. Qaanaaq (Thule); 4. for food
B. Predictions will vary. Actual answer is: by
dogsled
Reading Comprehension
1.c (lines 8-9);2. a (lines 38 -39);3. d; 4. a (line
6);5.d (line 28);6. C (lines 43- 44);7. b
Reading Skill
A. Positive: billiant, considerate, encouraging,
fortunate, warm; Negative: artificial, careless,
childish, rresponsible, jealous, stubbor
B.1. unfavorable, a. serious; 2. understandably
C. sympathetic
Critical Thinking
Answers will vary. Have students give examples
to support their ideas. The author points out
that without government help one winter, the
Inuit hunters would not have had enough food.
Vocabulary Practice
A.1. quantity; 2. starving; 3. urgent;
4. sufficient
B.1.b;2.b;3. b;4.b;5.a;6. b;7.b
结尾
Answer Key
Before You Watch
A. A rise in global temperatures from 2-5°C will
cause the size of the ice sheet to shrink severely.
B.1. measures; 2. approaching; 3. rapidly;
4. compressed; 5. computer models
While You Watch
A. 2,x,3,1,4.5
After You Watch
A.1.a;2.e;3.b;4.c;5. d
B.1. Answers will vary. Students should support
their answers with reasons and examples.
第十一单元答案
开头
Answer Key
1. Answers will vary. 2. Answers will vary. 3.
Answers will vary, but may incude those with
interesting life cycles such as buterflies and
silkworms that go through larva (caterpillar) and
pupa (cocoon) stages and then metamorphose
into their winged adult state.
11A
Answer Key
Before You Read
A. They cut into pieces and kill creatures much
larger than themselves.
B. Predictions will vary. Actual answers is: C
(lines 7-8)
Reading Comprehension
1.b (line 1);2.a (ine 10);3. a (line 9,
paragraph 3); 4. d lines 16-17):5.a;6.c; 7.c
(lines 30-32)
Reading Skill
A.1. Weaver, a person who weaves; 2. shorten,
to become short; 3. immature, not mature;
4. construction, the act of constructing;
5. useful, full of use
B.1. hunters; 2. unusual; 3. oversized;
4. non-army; 5. selfless
Critical Thinking
Answers will vary. Amy ants are loyal to their
colony. Many animals who live in groups, like
elephants, lions, whales, dolphins, etc, are loyal to
their groups. Some animals are known to choose
only one mate for life, such as wolves, swans,
beavers, and many kinds of birds. Animals that are
known for their loyal personalities to other animals
and humans include: dogs, horses, cats, etc.
Vocabulary Practice
A.1. nests; 2. constitute; 3. observed; 4. fellow;
5. loyalty; 6. prey
B.1.b;2.a;3.a;4.a;5. b
11B
Answer Key
Before You Read
A.1.1 a) a butterfly;2 b)a moth;3c)a
dragonfly 2. Answers will vary. Students may
want to comment on color, size, behaviors, etc.
B. b
Reading Comprehension
1. c;2.d (line 16):3.d;4. a;5. d (line 29);6. a;
7. b
Reading Skill
A.1.a
B. have created a new form of art; 1. beauty;
2. displayed; 3. lights; 4. scanner; 5. species
Answers will vary. Possible answers include:
bats, spiders, beetles, worms, etc.
Vocabulary Practice
A.1. exotic, 2. retain; 3. reaction; 4. emerge
B.1.b;2.a;3.b;4.a;5.a6.a
结尾
Answer Key
Before You Watch
A. From left to right, top to bottom:2, 1,4, 3
B. The buttrfly is most protected during the
pupa stage.
While You Watch
A.1.870; 2. the wild; 3. survival; 4. benefits;
5. income; 6.60,000; 7. 1,000
After You Watch
A.1.b;2.b;3.c4.a;5. b
B.1. Some people who would buy butterflies
include collectors, z005, researchers, etc;
2. Answers will vary. Students should support
their answers with reasons and examples; 3.
Some insect that could be commercially traded
include beetles, ladybugs, grasshoppers, etc.
第十二单元答案
开头
Answer Key
1, Answers will vary, 2. Some extreme places
include high mountain tops, deep caves, deep
under the sea, etc. 3. Some adventurous sports
include skydiving, BASE jumping. caving, rock
climbing, mountain climbing, backcountry
sking, etc.
12A
Answer Key
Before You Read
A.1. airplane; 2. Skydiving; 3. BASE jumping;
4. hang glider
B. 1. Answers will vary. Many people who enjoy
extreme sports like the experience of a thill and
the rush of adrenaline that goes with it
2. Answers will vary.
C.d
Reading Comprehension
1. d (line 1):2. C (line 21):3. C (line 24);4.b;5.
C (line 37); 6. b (line 45); 7.c (lines 42-43)
Reading Skill
A.1. it felt like falling from a building headfirst
(ines 28-29); 2.1 was more like a pigeon than an
eagle (ine 32); 3. tly as free as a bird (line 45)
B.1.4;2.a;3.d;4.c:5.e;6. b
C.1. cats and dogs;2, a pig; 3. a dog; 4. a bird
Critical Thinking
Answers will vary. The higher a flyer goes the
more danger there is in getting injured badly or
dying. Hang gliding might be considered the
safest because usually gliders don't fly at great
heights. However, BASE jumping is actually
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 lttle time to open their parachutes.
Vocabulary Practice
A.1. thrll; 2. towed; 3. steered; 4. feat; 5. courage
B.1.b;2.b;3.b;4.b;5.a;6. b
12B
Answer Key
Before You Read
A.1. descent; 2. passage; 3. entrance; 4. cave
B. b
Reading Comprehension
1.b;2. a (line 3); 3.c (line 35);
4. d (line 36);5. C (ine41); 6. d (ine 59); 7. C
Reading Skill
A.a footnote, a map, a photo, a caption
B.1. a (footnote on page 184); 2. b (caption on
page 184, line3- 4);3. b (map);4. d (line 7)
Critical Thinking
Answers will vary. Have students give examples
to support their ideas. We can learn a lot about
our physical world and nature by exploring
caves. Some might feel that caves like Krubera
are too dangerous to be opened to tourists, but
that caves that are easier to explore might be a
better choice for inexperienced cavers.
Vocabulary Practice
A.1. blocks; 2. necesity; 3. exhilarated;
4. conquer, 5. out of time; 6. ease; 7. ascend;
8. relatively
B.1. relatively; 2. depth; 3. ease,
4. disappointed; 5. blocking; 6. exhilarated
结尾
Answer Key
Before You Watch
A.1. Answers will vary. Students should support
their opinions with reasons and examples.
2. Answers will vary. Actual answer is: He was
skydiving too. 3. Answers will vary. Students
should support their opinions with reasons and
examples.
While You Watch
A.1.F;2.T:3.F;4.T
After You Watch
A.1. There are 5,000 skydivers at the convention;
2. Sanders films while skydiving from a helicopter,
3. Paul Waschak is ready to "jump the jet";
4. Sanders makes a less than perfect landing.
B.1. Sanders means that watching a skydive and
experiencing a skydive are two very different
things. The emotion and excitement of a free fall
cannot be communicated in a picture or video.
2. Answers will vary. Students should support
their answers with reasons and examples.
