第1单元答案
开头
Answer Key
1. Some of the unexplained mysteries
mentioned in the unit include red dlouds, UFOs,
the lost city of Alantis, castle ghosts, and the
Loch Ness Monster. 2. Answers will vary. Make
sure students understand that a mystery is
something unusual that is not well understood.
It describes a situation that we can't explain or
where we don't know the truth.
1A
Answer Key
Before You Read
A.1.b;2.a;3.d;4.c
B.b
Reading Comprehension
1.c(lines2- 4);2. b (lines 12-13);3. b;
4.a (line 19);5.c 6. b (paragraph2)
Reading Skill
A.1. Earth: lines 5, 16; 2. sideways: line 11;
3. flew: line 19; 4. saucers: line 21; 5. dead: line
21; 6. skies: line 27
B.1. Judy Varns (ine 2);: 2. Pat Travis (line 9);
3. new technology (lines 17-18); 4. pilot (line
19); 5. airplanes (ines 23- -24)
Critical Thinking
Answers will vary. Students should support their
opinions with reasons.
Vocabulary Practice
A.1. strange; 2. purpose; 3. area; 4. technology;
5. research
B.1.b;2.a;3.a;4.b;5. b
1B
Answer Key
Before You Read
A.1. sank; 2. rich; 3. island; 4. greedy
B.1. People names: Plato (line 3), Robert
Sarmast (lines 13, 14), Richard Elis (line 19);
2. Place names: Atlantis (itle, lines 2, 4, 12. 17,
19, 21, 23); Cyprus (line 14)
Reading Comprehension
1. b; 2. b (paragraph 2); 3.c (ine 16);4. C;
5.a;6.c
Reading Skill
A.1. skim; 2. scan; 3. scan; 4. skim
B. b
Critical Thinking
Answers will vary.
Vocabulary Practice
A.1. structure; 2. struck; 3. reported; 4. solid;
5. piece
B.1.T;2.F;3.F:4.F:5. T
结尾
Answer Key
Before You Watch
A.1.d;2.e;3.a;4.b:5.c
B. Answers will vary.
While You Watch
The picture shows a photograph that was
published in 1934 in a London newspaper of a
creature in Loch Ness, a lake in Scotland. The
photograph was proven to be a fake many years
later. The creature in the photographis not real,
but many people continue to believe in the
existence of the Loch Ness Monster.
After You Watch
A.1. People first reported strange movements in
the lake.; 2. Newspapers in the 19305 published
stories about the monster, but they had no
pictures.; 3: "Duke" Wetherall took a photo of
"Nessie."; 4. This photograph was published in
newspapers.; 5. The Loch Ness story continued
to grow.; 6. Christian Spuring told people the
true story.
B. Answers will vary. Possible answers:
1. Often when an unusual sighting is
announced, people suddenly tell simiar stories
in order to get attention.
2. Mysteries in the unit that scientists can
explain indude: the red cloud on Mauna Kea;
Area 51; some crop circles; places claimed so
far to be Atlantis; photos of the Loch Ness
Monster. Mysteries in the unit that scientists
can't explain completely include: aliens; UFO
sightings; existence of Atlantis; the structures
near the Yonagumi Islands; the dog ghost in
Leeds Castle; some sightings of the Loch Ness
Monster.
第2单元答案
开头
Answer Key
1. Answers will vary. Make sure students
understand that food from other countries can
refer to food cooked at home or food eaten in
a restaurant. Note that it's common for foreign
food to be changed somewhat to adapt to the
tastes of the people eating it. Sometimes it
becomes a whole new cuisine, such as Tex-Mex
in the United States or Japanese curry in Japan.
2. Answers will vary. Spicy dishes usually contain
chili peppers of some variety. Some examples of
spicy foods indude various types of curry, kimchi,
tom yum soup, bibimbap, and jerk chicken.
2A
Answer Key
Before You Read
A.1. According to the caption on page 22, many
people believe the Greeks were the first to make
pizza, but the Romans also made it. The passage
tells us that pizza-type food was made as long
ago as the Stone Age; 2. Answers will vary.
Olive oil and spices are mentioned in the caption,
but others include cheese, sausage, vegetables,
anchovies, and pepperoni; 3. Answers will vary:
B. Predictions may vary, but students should
be able to make guesses using the title and
subheadings. Actual answers are Where is pizza
from? and When did people first put tomatoes
on pizza?
Reading Comprehension
Multiple Choice, 1.c;2. a; 3. b;4. b;5. b (lines
17-18); 6. b (line 19)
Reading Skill
A. a title, subheadings, a main text, photos,
captions, footnotes
B.1.5;2.4; 3. No (There is no caption for the
picture of the tomato on page 24.); 4.3; 5. No
Critical Thinking
Answers will vary. Pizza is not generally
considered a healthy food these days, but it can
be made healthier with the addition of nutritious
toppings.
Vocabulary Practice
A.1.b;2.a;3.b;4.b;5.a
B.1. various; 2. cook; 3. traditional;
4. ingredient; 5. tasty
2B
Answer Key
Before You Read
A.1.T;2. F, The Scoville is a unit of heat used
to measure chilies;3. T; 4. F, Sweet bell peppers
have a rating of zero SHU.
B. Naga Jolokia, or "Ghost Peppers"
Reading Comprehension
A.1.b;2.c;3. a (lines 10-11); 4.b (line 16, or
the diagram on page 28); 5. C (line 24);6. C
Reading Skill
A.1.It = The jalapeno; 2. she = my mother;
3. they = chilies; 4. it = The cayenne pepper, 5.
them = chili peppers
B.1. Capsaicin; 2. Anandita Dutta Tamuly;
3. chilies (the heat of the chilies)
Critical Thinking
Answers will vary. Students should support their
ideas and opinions with reasons and examples.
Vocabulary Practice
A.1. recently; 2. dishes; 3. painful; 4. measure;
5. contains
B.1.c;2.b;3.d;4.a;5.e
结尾
Answer Key
Before You Watch
A.1. historic; 2. developed; 3. complex;
4. cultures
B. Answers will vary. Students should support
their guesses and ideas with reasons.
While You Watch
The video focuses on the food and traditions of
a part of Mexico called Oaxaca.
After You Watch
A.1. chilies, 2. coking school; 3. Europe:
4. ingredients; 5. mole; 6. history; 7. national;
8. hotel
B. Answers will vary. Students should support
their opinions with reasons and examples.
第三单元答案
开头
Answer Key
1. The photo shows dimate scientists working
in the Arctic. An important part of the job of
a limate scientist involves studying weather
conditions, which can take the scientists to places
of extreme temperatures or conditions, as in
this photo. Whether students would enjoy a job
like this will depend on individual personalities
and tastes. Perhaps this is a job that suits people
who are comfortable being in extreme climate
conditions. In addition, most scientists spend a
lot of time researching. collecting data, studying
data, and analyzing results- -tasks students
would need to be excited about to excel at this
job. 2. Answers will vary. Students should give
examples of any jobs that they consider "cool."
Make sure students understand that cool means
"interesting" or "unique," not "cold."
3A
Answer Key
Before You Read
A.1.e;2.c;3.b;4.a;5.d
B.1. He wrestled with grizzly bears. / He
worked as an animal trainer:; 2. Wasatch Rocky
Mountain Wildlife, an animal-training center
Reading Comprehension
1. C;2. a; 3. a (paragraphs 2-3); 4. a (line 11);
5.b;6. b
Reading Slkill
A.1.b;2.c;3.d;4. a
B. Parts of speech and possible definitions: 1.
noun, school / a place with buildings where
training or another activity is learned; 2. verb,
seems; 3. noun, the part of the body behind the
chest, below the shoulders, and above the hips;
4. noun, a surface outside, such as grass or dirt,
that we stand on
Critical Thinking
Possible answers: dogs, birds, horses, mice, and
cats
Vocabulary Practice
A.1. ificult; 2. enjoy; 3. comfortable; 4. take
care of
B.1.a;2.b;3.b;4.a;5. b
3B
Answer Key
Before You Read
A. Answers will vary. Students should support
their answers and ideas with examples and
reasons.
B. Question 1: How did you become a National
Geographic photographer?; Question 2:
What kind of photographers is the National
Geographic magazine looking for?; Question
3: Is it dfficulit to get a job as a photographer
today?; Question 4: Iwant to be a
photographer. Do you have any advice for me?
Reading Comprehension
1.b;2. b (line 6);3. C (lines 19, 21-23); 4. C;
5.c (lines 26 -28):6. C
Reading Skill
A. The following should be checked: 1,3, 4.
B.1. Joel Sartore is a writer, teacher, and
photographer; 2. And that led to a nine-
day job, and so on, 3. To get into National
Geographic, you have to give them something
they don't have,; 4. If you do it for the money,
you probably won't really be happy;5. If so,
you'll enjoy the work much more.
Critical Thinking
Answers will vary. Possibilities include: What's
the most interesting picture you've taken? If you
weren't a photographer, what would you be?
Vocabulary Practice
A.1. spent; 2. enough; 3. image; 4. situation
B.1.T:2.T3.F:4.T:5.T
结尾
Answer Key
Before You Watch
A. Students read the paragraph and pay
attention to the words in bold.
B. Guesses will vary. Actual answers are pick up
things, find help, call the police, turn lights on,
be comfortable with people, and get along with
other animals.
After You Watch
A.1. want to help their owners; 2. better
learners; 3. face situations; 4. experience the
world outside
B.1. needs help; 2. the dog can decide; 3. finda
way to deal with it
C.1 and 2. Answers will vary.
第四单元答案
开头
Answer Key
1. Answers will vary. Some famous shipwrecks
include the Titanic shipwreck in the North
Atlantic Ocean, the Black Swan shipwreck off
the coast of Spain, the Yongala in the Great
Barrier Reef in Australia, the Lusitania off the
coast of lreland, and the Bom Jesus off the
Skeleton Coast;
2. Answers will vary.
4A
Answer Key
Before You Read
A.1.T;2. F (mostly women and children got into
lifeboats);3. T; 4. F (nobody knew for 73 years)
B. Ballard visited the Titanic three times: 1985,
1986, and 2004.
Reading Comprehension
1.c,2.a (lines7-8, 10); 3.a (lines 1-2); 4. b
(line 15):5. b (line 18); 6. a (lines 22-23)
Reading Skill
A.b
B. Paragraph 1. b; Paragraph 2. b; Paragraph 3.
b; Paragraph 4. b; Paragraph 5. a
Critical Thinking
Answers will vary. Students should support their
opinions with reasons and examples.
Vocabulary Practice
A.1. deaths; 2. conditions; 3. reach; 4. returned
B.1.a;2.a;3.b;4.a;5.a;6. b
4B
Answer Key
Before You Read
A.1. coast; 2. sailors; 3. bones; 4. skeleton
B. Predictions will vary. Actual answers: how a
ship became wrecked; what was found on the
shipwreck
Reading Comprehension
1.c (lines4 -5);2. b;3.c (line 11);
4.b (lines 15-16):5. b (dine 22):6. a
Reading Skill
A. On July 17.1956, the Andrea Doria left Italy
for New York. The ship was carrying over 1.700
passengers and crewmembers A week later, the
Stockholm Teft New York for Sweden. That night,
the( Andrea Doria and Stockholm rossed paths
with tragic results. Just after 11:00 p.m, the
Stockholm smashed into the side of the Andrea
Doria. The Andrea Doria began to slowly sink.
The Stockholm helped with the rescue of the
passengers, but there would be 52 deaths that
night. Weredarkness and bad weatherthe cause
of the accident? It remains a mystery to this day.
B.1. more copper, many gold coins; 2. maps,
books about the ships; 3.3000 people, a large
amount of treasure
Critical Thinking
Answers will vary. Students should support their
opinions and ideas with reasons and examples.
Vocabulary Practice
A.1. carrying; 2. amount; 3. distant; 4. metal;
5. letter
B.1. hole; 2. beach; 3. metals; 4. expensive
结尾
Answer Key
Before You Watch
A.1.d;2.c3.b;4.e;5.a
B. Predictions will vary. The actual answer is that
shipwrecks help save ocean life because they
stop trawlers from damaging the seabed.
After You Watch
A.1. war, 2. tearing up trawl nets; 3. metal;
4. falls apart; 5. build concrete walls; 6. smart
B.1. Sobel means that he believes that a way
will be found to save ocean life,; 2. Answers
will vary. Students should support their ideas
with reasons and examples. Some ways that
individuals can protect ocean life include not
lttering. not overfishing. not polluting. not
wasting water, etc.
第五单元答案
开头
Answer Key
1. The photo shows a crime scene investigator
examining shattered glass. He is likely looking
for evidence, such as blood, DNA, or a hair, that
can help him identify the person who committed
the crime.; 2. Answers will vary. Students
have already learned about cdimate scientists
in a previous unit. Some other examples of
jobs that involve science are doctors, dentists,
weather forecasters and meteorologists, science
teachers, and science writers. In addition, many
jobs may involve science indirectly, a theme
that was touched on by National Geographic
photographer Joel Sartore in his interview in
Unit 3B.
5A
Answer Key
Before You Read
A.1. the police; 2. and 3. Answers will vary.
B. The clues he finds include a broken window,
glass on the street, shoeprints, marks made by a
tire, fingerprints, and a hair.
Reading Comprehension
1. b;2. b; 3. b (lines 8-12); 4. b (lines 16-18);
5.a (line 20); 6. b (lines 29-30)
Reading Skill
A.1.b;2.b;3. b
B. Boxes 2. and 5. should be checked.
Critical Thinking
Answers will vary. Students should support their
ideas and opinions with reasons and examples.
Vocabulary Practice
A.1. catch; 2. comparing; 3. direction; 4. possible
B.1.a;2.b;3.b:4.a
5B
Answer Key
Before You Read
A.1. strains; 2.出; 3. bacteria; 4. microscope
B. how a doctor found the cause of an ilness
Reading Comprehension
1. b;2. b (lines 15 20); 3. a (lines9, 11);4. b
(line 17); 5. b (paragraph 5); 6. C (lines 22-24)
Reading Skill
A. The following items should be checked: to
introduce a topic, to help explain a photo, to
provide facts, to give a definition.
B.1.a;2.a;3.b;4.a
Critical Thinking
Possible answers include: washing your hands
regularly, deaning food before eating it, cleaning
kitchen utensis well, having vaccinations, wearing
a mask to prevent spreading germs.
Vocabulary Practice
A.1. dangerous; 2. kl; 3. expert; 4. touch
B.1.F:2.T;3.F:4.T:5.T
结尾
Answer Key
Before You Watch
A.1. prevent; 2. deadly; 3. spread; 4. cure; 5. kill
B. Answers will vary. The video tells uS that the
team of scientists believes that most viruses start
and spread in warm places.
After You Watch
A.1. animals; 2. wild animas; 3. warm; 4. the
whole world
B.1. Yes. Students might be familiar with avian
influenza, or bird flu, which spreads from birds
such as chickens; 2. The video tells us that
eating wild animal meat is one way; 3. The
video explains that viruses are spreading more
easily from country to country because we are
so in contact with people from all parts of the
world now.
C.1. Answers will vary;
2. Answers will vary. Posibilities include:
washing your hands regularly, bowing as a
greeting instead of shaking hands, and not
eating wild animal meat.
第六单元答案
开头
Answer Key
1. Answers will vary. Some famous explorers
include Marco Polo, Ibn Battuta, Lewis and
Clark, Zheng He, and Matthew Henson.
There are pioneers in all fields and industries.
Some examples include Johannes Gutenberg
in printing, Albert Einstein in science, Martin
Luther King. Jt. in civil rights, and Amelia Earhart
in aviation,; 2. Answers will vary.
6A
Answer Key
Before You Read
A.1. coin; 2. trbe; 3. statue
B. how Sacagawea helped the explorers, how
people remember Sacagawea today
Reading Comprehension
Multiple Choice. 1. C2. b (line 10):3. C (line
15):4. b (line 19);5.C6. b (lines 23-25)
Reading Skill
A. The events can be found on the following
lines;a line 5; b. lines 22-23;C line 15; d. line
4;e.lines 6-7;f. lines 20-21:g. line 12
B. from left torightd,a,e,g.c.f,b
Critical Thinking
Answers will vary. Students should support
their ideas with reasons and examples. Finding
information on Sacagawea is probably so
difficult because she lived in more than one
place from a young age and died at a young
age. Because she was a Native American, there
would not be many written records of her life
and movements. Her significant role on the
team of explorers and in American history was
only reallyl recognized many years after her
death.
Vocabulary Practice
A.1. clearly; 2. actions, 3. among; 4. travel;
5. save ;
B.1.a;2.a;3.a;4.b
6B
Answer Key
Before You Read
A.1. member; 2. team; 3. sleds; 4. on foot
B. eight times
Reading Comprehension
1. C (lines 10-13); 2. b (lines 9-10);3. a;
4.c (line 17);5.b;6.a
Reading Skill
A.1. Greenland; 2. outdoors; 3. snowshoes;
4. dogsleds
B.1. dlassmate, dassroom; 2. blackboard,
blackbird; 3. outside, outdoors; 4. somebody,
someday; 5. daytime, daylight, 6. raincoat,
rainwater; 7. sunshine, sunset; 8. uphil, upgrade
Critical Thinking
Answers will vary. Students should support their
answers with reasons and examples.
Vocabulary Practice
A.1. well-known; 2. ahead; 3. join; 4. hero;
5. drive
B.1.F:2.T;3. T:4. T:5. F
结尾
Answer Key
Before You Watch
A. Students discuss what they know about
Native Americans.
B. Predictions will vary. Actual answers are the
following: Many of them got sick. They taught
the settlers about their culture. Their population
decreased. They had to leave their homes. They
lived in bad conditions.
After You Watch
A. from left to right: 1.5,2,3.6, 4
B.1. Asia; 2. totem pole; 3. the government;
4. cloud people
C. Answers will vary.
第七单元答案
开头
Answer Key
1. Answers will vary. The picture makes us see
an ilusion. It looks like the people are exercising
on the edge of a cliff when they are actully on
a flat surface.,; 2. Answers will vary. Students
should describe the last dream they can
remember.
7A
Answer Key
Before You Read
A. Answers will vary. Possible answers:1.c;2.a;
3. b;4.d
B. Predictions will vary. Three different types
of dreams are discussed and interpreted in the
passage.
Reading Comprehension
1.c;2.c (ine3); 3.c (line 12):4. C;
5.a (lines 1920); 6. C (last paragraph)
Reading Skill
A. Answers may vary. However, students should
recognize what the main idea of the passage is
and what key details support it.
Main Idea: Our dreams come from a part of the
brain that contains our thoughts and memories.
(lines 2-3);:
Key Details: "Dreams help us get in touch with
our deeper feelings," he says. (lines 9 -10);
Stickgold says the purpose of dreaming through
these memories is to help us learn from the past.
(lines 14-15); Some people think we dream
about embarrassing situations if our brains are
trying to deal with an event in our own lives.
(lines 20-22); If you dream about flying. you are
probably quite happy. (line 24); This probably
means you are worried about an important
event coming in your life. (lines 28 -29)
B.1.40 minutes; 2. remember, 3. Why;
4. problems; 5. meaning; 6. embarrassing;
7. happy; 8. worried
Critical Thinking
Answers will vary. Students should support their
opinions with reasons and examples.
Vocabulary Practice
A.1. result; 2. lasts; 3. useful; 4. prepare;
5. worried; 6. Problems; 7. period; 8. leader
B.1. periods; 2. lasts; 3. problems; 4. results;
5. worried; 6. prepare; 7. useful
7B
Answer Key
Before You Read
A.1. and2. Answers will vary. The ilusion of the
boy standing in the spoon is made by having the
boy stand at a distance from the camera while
someone else holds the spoon very close to the
camera.
B. Predictions will vary. Each ilustration tries to
trick the mind by presenting the appearance of
something that isn't there.
Reading Comprehension
1.c;2.c (lines 18-19); 3.a (line 17 ); 4. b (lines
28- 29);5. b;6. b (line 7)
Reading Skill
A.1.and;2. or; 3. so; 4. but
B.1. and; 2. but; 3. or, 4. so
Critical Thinking
Answers will vary. Students should support their
opinions with reasons.
Vocabulary Practice
A.1. trust; 2. mistake; 3. Therefore; 4. stare
B.1.a;2.b;3.b:4.b;5.b;6. b
结尾
Answer Key
Before You Watch
A. Answers will vary.
B. Predictions will vary. Actual answers are the
following: 1. b;2. b.
While You Watch
B. fighting, tllking
After You Watch
A.1.c;2.c;3.c
B. Stage1:3, 4; Stage2:1,5, 6
Stages3 and 4:2, 7
C.1. Answers will vary. Generally, you are NOT
supposed to wake a sleepwalker, but rather
guide them back to bed. 2. Parasomnia can be
dangerous because a person could possibly get
hurt while moving around in their sleep.
第8单元答案
开头
Answer Key
1. and 2. Answers will vary, Students should
support their opinions with reasons and
examples. Make sure students understand that
feelings in Question 2 refers to emotions such as
happiness and sadness, and not sensations like
heat and cold.
8A
Answer Key
Before You Read
A. Guesses will vary. Actual answers: 1.F:2. F;
3.F;4.T;5.T
B. Predictions will vary. Actual answers: emperor
penguins and their babies, young penguins
getting older
Reading Comprehension
1.a;2.a (lines4 6);3. a (lines4, 12); 4. a;
5.b (line21):6. b
Reading Skill
A.1.a;2.b;3. b
B.1. lines 12-13. For two months, the father
penguins keep the eggs safe and warm.; 2. lines
19 20, The mother penguin returns just in time
to see her baby come out of its egg.; 3. line 21,
This can be ifiult; 4. line 27, The chick grows
quickly and is always hungry; 5. lines 29 30, The
chick is five months old and can live on its own.
Critical Thinking
Answers will vary. Students should support their
opinions with reasons and examples.
Vocabulary Practice
A.1. parents; 2. adult; 3. on their own;
4. special; 5. enter
B.1.b;2.a;3.a;4.b
8B
Answer Key
Before You Read
A. Guesses will vary. Possible answers: 1. anger,
surprise; 2. anger, surprise; 3. happiness;
4. boredom
B. There are six names. Human names: Sally
Blanchard (line 6), Jean Donaldson (line 15)，
Patricia Simonet (line 23); Pet names: Bongo
Marie (line 5), Paco (line 7), Buffy (line 16)
Reading Comprehension
1.b;2.b (lines6- 8);3. b;4. b (lines 18-19);
5.c,6.b (line 27)
Reading Skill
A.b.c.d.f
B.1. joke; 2. laughed; 3. toys; 4. hilarious;
5. laugh; 6. play
Critical Thinking
Answers will vary. Each detail in Activity B
supports the theory that animals could possibly
have a sense of humor.
Vocabulary Practice
A.1. similar, 2. relationship; 3. assess; 4. behavior
B.1.F:2.T:3.T:4.T:5.T;6. T
结尾
Answer Key
Before You Watch
A.1. Answers will vary. Leopard seals and
penguins have the most agility while in water, so
leopard seals often try to catch penguins in water.
However, in the video, students will see a leopard
seal try to catch a penguin on land as well. The
seals use their mouths to grab the penguins.
B. Students should check their answers on the
bottom of page 118. Answers: female, on their
own, pup, other seals
While You Watch
1.T;2.F:3.T;4.F
After You Watch
A.1.d;2.c;3. a;4.e;5.b
B. Answers will vary. Students should use thelr
own words to talk about each point in Activity A.
C.1. and 2. Answers will vary. The quote
from the video, "In Antarctica, every dayis a
fight for survival," tells us that Antarctica is
a hard place for animals to live. For example,
the temperatures are freezing, the weather is
extreme, food is scarce, and there are dangerous
predators such as the leopard seal. Note that
these are not conditions that humans would be
able to easily survive in, which is why animals
are the only native inhabitants of Antarctica.
第9单元答案
开头
Answer Key
1. Answers will vary. The building has many
interesting features, including its bright colors,
its multiple domes, its many shapes, and its
location on Red Square. 2. Answers will vary.
Students should give examples of famous
buildings in their home countries.
9A
Answer Key
Before You Read
A.1. emperor; 2. dome; 3. marble; 4. monuments
B. Predictions will vary. Actual answer: He built
it for his wife, the empress, as a monument after
her death.
Reading Comprehension
1.b (lines 3- 6);2.a (lines 9-11); 3. C
4. b (line 16);5.a (line 14); 6. C (ine 24)
Reading Skill
A.1. Before; 2. After, 3. when; 4. but
B.1. because; 2. When; 3. before; 4. while;
5. because; 6. Although;7. If; 8. because
Critical Thinking
Answers will vary.
Vocabulary Practice
A.1. couple; 2. finished; 3. legend; 4. supposedly
B.1.a;2.b;3.a;4.a
9B
Answer Key
Before You Read
A. 1. Florence, Italy; 2. Guesses will vary. There
are actually two domes. One is made of stone
and one of light brick.
B. Predictions will vary. Actual answers: what
materials to use, how to support the dome
Reading Comprehension
1.a (line 10):2. b;3.c (lines2, 8, 24);
4.c (ines 22-23);5. b;6. a (lines 26-28)
Reading Skill
A.
●Any visitor to Florence should dlimb to the top
of the cathedral. It's an easy walk up the stairs
to the dome area.
●The dome is covered with lovely paintings.
Look closely at the walls for graffti that was
made by other tourists. Much of it is over a
hundred years old. It gives you an idea of the
many people who came before you.
●From the top, you get a great 360-degree
view of Florence. You can see many of the
famous places in the city from there.
B.1. in; 2. of; 3. of, from; 4. with; 5. into; 6. in;
7. of
Critical Thinking
Answers will vary. Students should support their
ideas and opinions with examples and reasons.
Vocabulary Practice
A.1. material; 2. supported; 3. design; 4. project
B.1.a;2.b;3.b;4.b
结尾
Answer Key
Before You Watch
A.1.d;2.c;3.e;4.b;5.a
B. Guesses will vary. Actual answers:
1.463; 2. four milion; 3. under the cathedral;
4. Michelangelo's David
After You Watch
A.1. eight:; 2. dome from changing shape;
3. ahead of their time; 4. pattern
B. Answers will vary. Students should support
their opinions with reasons and examples.
第10单元答案
开头
Answer Key
1. Answers will vary; 2. Many parts of the world
are experiencing warmer and more extreme
weather conditions due to global warming.
10A
Answer Key
Before You Read
A.1.F:2.T:3.F:4.T:5. T
B.C
Reading Comprehension
1.b;2. a;3.c4.b:5.b,6.b (lines 29 -30)
Reading Skill
A.1.b
B.1.d:2.c:3.a;4.b
Critical Thinking
Answers will vary. Students should support their
ideas with reasons and examples.
Vocabulary Practice
A.1. temperatures; 2. losses; 3. occurred;
4. frequent; 5. forecasts
B.1.b;2.b;3.a;4.a
10B
Answer Key
Before You Read
A.1. and 2. Answers will vary. Note that strange
weather can include unusual events like heavy
snowfall in places where there's usually only
light snowfall, or extreme events like flash floods
or powerful storms.
B.1. Strange Rainl; 2. Tormnadoes of Fire;
3. Great Balls of Icel
Reading Comprehension
1.c2. a;3. b (lines 12-15);4. b (line 21);5. C;
6. a (lines 34 35)
Reading Skill
A. Paragraph 1: It was raining frogs! (cause,
line 8), they found their streets flled with ltte
jumping creatures (effect, line 9)，a tomado
passed over a lake (cause, lines 12-13), it
sucked up animals that lived there (effect, line
14), the frogs were carried into the air (cause,
lines 14-15)，they were dropped in the Serbian
town (effect, lines 14-15)
Paragraph 2: a wildfire reaches high
temperatures (cause, line 18), causes the air to
become hot and to rise (effect, line 19)，cooler
air rushes in to replace the hot air (cause, lines
19-20)，This creates strong winds. (effect, line
20)，winds suck up burning plants and even the
fire (cause, line 21), a tormado of fire is produced
(effect, line 23)
Paragraph 3: Hailstorms form (effect, line 33),
raindrops high in the sky turn to pieces of ice
(cause, lines 33-34)，the ice pieces increase in
size until the wind cannot hold them up (cause,
lines 34- 35), hailstones alling to the ground,
often at speeds of over 160 kilometers an
hour (effect, lines 36 -37). there was nowhere
to run (cause, line 38), They were all klld by
hailstones (effect, lines 38 39)
B.1.e:2.d:3.c4.f:5.b:6.a
Critical Thinking
Answers will vary. Students should support their
ideas with examples.
Vocabulary Practice
A.1. weird; 2. rushing; 3. actually: 4. increase;
5. warning
B.1.a;2.a;3.b;4.a
结尾
Answer Key
Before You Watch
Answers will vary.
While You Watch
B.1.a;2.a;3.a
After You Watch
A.1.2;2.1:3.2;4.3;5.1
B.1. Answers will vary. The quote means that the
destruction from Katrina completely changed the
lives of many people in New Orleans,; 2. Answers
will vary. Tropical storms are given names so it
is easy to refer to one when more than one is
occuring at the same time.
第11单元答案
开头
Answer Key
1. and 2. Answers will vary. Note that answers
for Question 1 can include both dinosaurs and
modern animals that have gone extinct.
11A
Answer Key
Before You Read
A.1. extinct; 2. lce Age; 3. tusks
B. Predictions may vary. In the end, the baby
mammoth was put in a museum. Prior to being
placed in a museum, it was taken, sold, picked
up by a helicopter, examined, and sent to the
Netherlands and Japan.
Reading Comprehension
1.b;2. a (lines 10-14);3. C:4. C 5.a (lines 16
and21); 6.c (line 21)
Reading Skill
A.1. These pictures, P: 2. The paintings, A:
3. Mammoth tusks, P:4. These tools, P:
5. People, A
B.1. had eaten (active); 2. was taken (passive);
3. was sent (passive); 4. will explain (active)
Critical Thinking
Answers will vary. Students should support their
opinions with reasons.
Vocabulary Practice
A.1. imagine; 2. vanished; 3. further, 4. details;
5. perfect
B.1.b;2.a:3.a;4.a
11B
Answer Key
Before You Read
A. From left to right: 4. tail, 5. fin, 3. stomach,
1. jaws, 2. teeth
B.1. three; 2. Possible answers include: one
could see in the dark, one was especially
frightening, and one fllowved others around.
Reading Comprehension
Multiple Choice. 1.c;2. b;3. b (ine 20);
4. b (line 28):5. C (lines 2627);
6.c (lines 32-33)
Reading Skill
A. Living now, on land: elephant, crocodile
Living now, in water: crocodile, shark, whale
Extinct, on land: mammoth, Kronosaurus
Extinct, in water: Temnodontosaurus,
Kronosaurus
B. Meaning of name: "cutting-tooth lizard";
"Kronos lizard"; "lord of the seas"
Unusual characteristics: had very large teeth
and eyes; had teeth the size of bananas; had a
very long neck and stones in its stomach
Special abilities: could easily see its food in the
dark water, could catch smaller animals with
its strong jaws; was able to get close to fish
without being seen
Critical Thinking
Answers will vary. Students should support
their ideas with reasons and examples. All
three creatures lived in the sea, although the
Kronosaurus also went on land. They were each
very large and had unusual characteristics. All
three were killd at catching food.
Vocabulary Practice
A.1. rise; 2. characteristics; 3. predators;
4. means; 5. chance; 6. figure out; 7. definitely
B.1. characteristics; 2. means; 3. chance;
4. function
结尾
Answer Key
Before You Watch
1. Answers will vary; 2. Sauropods only ate
vegetation. Other dinosaurs ate meat.; 3. Yes;
4. Possibilities include crocodiles and birds.;
5. How dinosaurs died out is actually not known
for certain, although many scientists believe it
was the result of a meteor that struck the Earth:;
6. Scientists learn about dinosaurs by studying
fossis from the past.
While You Watch
B.1. ossilized bones; 2. one meter long; 3. cold
and dark; 4. birds
After You Watch
A.1.F:2.T:3.T4.T5.F
B.1. The narrator is trying to explain the timeline
of the age of dinosaurs on Earth in comparison to
that of humans; 2. Answers will vary.
第12单元答案
Answer Key
1. Answers will vary. Some examples of
everyday technology include computers,
printers, smartphones, TVs, home appliances,
and cars. 2. Answers will vary, Students should
support their ideas with examples.
12A
Answer Key
Before You Read
A. Answers will vary.
B. Items mentioned in the passage that robots
can actually do now incude play soccer, walk,
run, dlimb stairs, jump, walk up walls, and walk
on water.
Reading Comprehension
1.a;2.b;3. b (ine 16); 4. C (line 22);
5. a (line 25);6. C (lines 28-29)
Reading Skill
A.1. soccer (line 4); 2. help take care of children
or the elderly (lines 6-7); 3. fight fires (line 7);
4. robot vacuum cleaners (ine 12); 5. Honda's
ASIMO (line 12)
B.1.d;2.c;3.b;4.a
Critical Thinking
Students should support their opinions with
examples. It is likely that robots will excel at
simple tasks and jobs but not at ones that
require creative thinking or innovation.
Vocabulary Practice
A.1. simple; 2. rough; 3. altermative;
4. uncomfortable
B.1.a;2.a;3.b;4.a
12B
Answer Key
Before You Read
A.1. Answers will vary. Students should be able
to understand from the pictures that the passage
talks about how daily life will be in the future,
induding home life and health; 2. Answers will
vary. Possible answers include: transportation,
entertainment, communication, and police work.
B. The following topics are talked about in the
passage: health, dlothing. food, transportation.
Reading Comprehension
1.b;2. a (lines4-5);3. c:4.b.5.c (line 15);
6. a (lines 19-20)
Reading Skill
A.1. react; 2. international; 3. prepaid
B.1. painful; 2. asssment; 3. invention
C.1. anti-aging. helps you fight the effects of
aging; 2. treatment, the act of getting treated;
3. youthful, full of youth
Critical Thinking
Answers will vary. Some of the items already
exist; however, they are not as advanced as the
ones described in the passage.
Vocabulary Practice
A.1. mirror, 2. grocery; 3. surroundings;
4. laboratory; 5. treatment; 6. program; 7. future;
8. Electricity
B.1. program; 2. grocery; 3. laboratory; 4. future
结尾
Answer Key
Before You Watch
Predictions will vary. Actual answers: record videos,
pick up small animals, take photos, suck things up,
measure things, cut things, dig in the ocean floor
After You Watch
A.1.b;2.b;3.a;4.c
B.1.a;2.c3.e;4.b;5. d
C. Answers will vary. Students should support
their ideas with reasons and examples.
