第1单元答案
开头
Answer Key
1. -3. Answers will vary. Important factors
for a great photograph include composition,
light, and subject matter. Write the sentence
“A picture is worth a thousand words" on the
board, and ask students what they think it
means. Is it sometimes easier to tell a story with
one picture, or with many words?
1A
Answer Key
Before You Read
A.1. document; 2. amateur; 3. shot; 4. app
B.b
Reading Comprehension
1.d (lines 32-36); 2. a (lines 46 48):3.c;4.c
(ines83- -88):5.c;6.d;7.b
Reading Skill
A.1. b;2.b;3.a;4.b;5.b;6. a;7.a;8. a;9.b
Vocabulary Practice
A.1. quality; 2. Amateur; 3. obsessed;
4. profound; 5. tremendous
B.1.b;2.b;3.a;4.a;5.a
1B
Answer Key
Before You Read
A.1.e;2.f;3.c4.g:5.b;6.a;7.d
B. Answers will vary. Challenges mentioned in
the passage include: high expectations (lines
33- 34), pressure to do well (lines 82-86), and
transportation (lines 87-88).
Reading Comprehension
1.b;2.c;3.c (lines 24-25); 4. a (lines 34-38);
5. b (lines 55 -68); 6. C (lines 87-88);
7. c (lines 123-124)
Reading Skill
A.1.F (ines 8-10);2. F (ines 29-31); 3. T (lines
27-28);4. T (lines 32- 33); 5. F (lines 44 45);
6.F (lines 60-64); B.1. Pulitzer; 2. year;
3. mule; raft; 4. two; 5. difference, 6. touch
Vocabulary Practice
A.1. overcome; 2. expectations; 3. thus;
4. teamwork; 5. portrait; 6. projected
B.1. turn out; 2. enrich; 3. project; 4. praise;
5. staff; 6. teamwork; 7. expectation; 8. portrait
结尾
Answer Key
Before You Watch
A.1.-3. Answers will vary. Possible answers
include: 1. people outside, in their natural
environment; 2. natural, realistic, beautiful
While You Watch
A.1.F:2.T:3. T:4.T:5.F
B.1. dark; 2. flexibility; 3. flxible; 4. wonderful;
5. trrible; 6. available; 7. communication;
8. creative; 9. ristically
After You Watch
A.1. Answers will vary. 2. She means that it
isn't easy; in fact, it is very difficult. Butit is
very exciting at the same time. 3. Answers will
vary. It might have been hard for them to be
away from home and from their friends. They
also might have had to make up a lot of school
work.
第2单元答案
开头
Answer Key
1. Answers will vary. Some animals show
magnificent displays of color and dance in order
to attract a mate. Some animals bring "gifts" of
sticks, berries, etc., to potential mates.
2. Answers will vary. Possible answers include:
looks, personality, a sense of humor, wealth,
and education. 3. Answers will vary. Possibilities
include the idea that different parts of the brain
and chemicals in the body might be responsible
for feeling love.
2A
Answer Key
Before You Read
A. Answers will vary.
B.1.d (lines 35 -36);2. a (lines 59 60):3. b
(lines 7677); 4.c (lines 93- 94)
Reading Comprehension
1. C;2.c (lines 19 20); 3. C (lines 35 42);
4.b (lines 54 -56); 5. a (lines 78-82); 6. b (lines
119-122); 7. a (lines 128-131)
Reading Skill
A. and B.1. T; scientists believe; 2. F:3. T; most
Indians stil believe; 4. T; Some psychiatrists;
hypothesize; 5. T; According to this theory;6. T;
According to this hypothesi;7. F:
8. T; According to other researchers; 9. F;
10. T: may; 11. T: Fisher has suggested; 12. F;
13. T, oxytocin is believed to be
Vocabulary Practice
A.1. defiance; 2. romance; 3. desire; 4. recruit
B.1. inherently; 2. trigger, 3. mutual;
4. inclination; 5. abundance; 6. chance
2B
Answer Key
Before You Read
A.1. No; 2. No;3. Yes; 4. Yes
B. Predictions will vary. The article covers all the
information listed.
Reading Comprehension
1. b (lines 8-10); 2. a; 3.c (lines 45 47); 4. d;
5. a (lines 114-116); 6. C (lines 119-121);7. d
Reading Skill
A.1.M/P:2. M/P:3.S;4.S;5. M/P
B.1.h;2.g;3.f4.i:5.a;6.d;7.e;8.b;9.c
10.j !
Vocabulary Practice
A.1. ritual; 2. bouncing; 3. prominent;
4. absurd; 5. harsh
B.1. breed; 2. commence; 3. undergo; 4. evoke;
5. noble; 6. absurd; 7. prominent; 8. ritual
结尾
Answer Key
Before You Watch
A.1. tunes; 2. frequencies; 3. break into song;
4. vocalizations; 5. ultrasonic 6. courtship
B.1. Answers will vary;2. Answers will vary.
Possbilties include birds, whales, dolphins,
frogs, cats, and insects. 3. Answers will vary.
Possibilities include dancing. displaying colors,
fighting, and producing scents.
While You Watch
A.1.T (It's believed..);2. F;
3. T (It's not known yet why male mice..);
4.T(.. . but whether it actually enhances their
mating success is something we don't know yet.)
B.1. mate; 2. mammals; 3. complex;
4. researchers; 5. genes; 6. future; 7. opposite;
8. bolder
After You Watch
A. Answers will vary.
第3单元答案
开头
Answer Key
1. Answers will vary: 2. Answers will vary.
Possible answers include: foods that are not
properly stored, such as foods that need to
be refrigerated; meats; 3. Answers will vary.
Possible answers include: growing genetically
modified foods; being less wasteful; improving
farming fficiency.
3A
Answer Key
Before You Read
A.1. toxins; 2. bacteria; 3. immune system;
4. foodborne
B. AnE. coli O157:H7 outbreak was responsible
for 732 lnesses and the death of four children.
Reading Comprehension
1.c;2.c (lines 14-16);3. b (lines 46 -49);4. a
(lines 87-91); 5. a (lines 120-125); 6. b (lines
139-143); 7. b
Reading Skill
A.1. Ldidn't go to the doctor because Lforgot.
about the appointment; 2. The medicine in our
cabinet was old, so we threwit out;
3. The reason Ldidn't go to school was that L
had a stomachache; 4. The scientist published
her findings. Consequently, she was able to help
many people; 5. Due to new health guidelines,
all food will be removed from the staff fridge
onweekends; 6. Investigators believe improper
hand washing led to the disease outbreak at the
school
B.1.c (lines 41-44); 2. e (lines 57-64);
3. a (lines 122-125); 4. d (lines 131-143);
5. b (lines 146-152)
Vocabulary Practice
A.1. compulsory; 2. integral; 3. nationwide;
4. diligent; 5. contaminated
B.1.a;2.b;3.a;4.b;5.a
3B
Answer Key
Before You Read
A. Answers will vary. Possible benefits include:
eliminating world hunger; possible risks include:
potential health issues.
B. Answers will vary. Answers mentioned in the
passage include: 1. blotech foods appear to be
safe or even safer than conventional varieties
(lines 56 65); 2. people have mixed opinions
(lines 88 96); 3. although there are skeptics,
many scientists think so (lines 110-114 and
lines 130-133).
Reading Comprehension
1.b; 2. d (lines 31-35); 3. C; 4. a (lines 61-62);
5.d (lines 99-103); 6. d (lines 120 122); 7.a
Reading Skill
A. Posible answers: Arguments for: potential to
improve the quality and nutritional value (lines
6 -8); help farmers deal with age-old farming
problems (lines 46 48); problems have been few
(line 50); safer than conventional varieties (lines
56 57); may actually be good for the land (lines
91-96); can help address the urgent problems of
food shortage and hunger (lines 110-114)
Arguments against: rushed to market (lines
9-12); problems in the past (lines 67- 68);
harmful proteins (ines 69 74); developed
too quickly and released before they've been
adequately tested (lines 88 90); golden rice is
lttle more than a public relations exercise (lines
127-130)
B.1. genetic; 2. alergic; 3. pesticides; 4. grow
crops; 5. slip by undiscovered; 6. health effects;
7. adequately tested; 8. public relations exercise
Vocabulary Practice
A.1. modified; 2. revolutionary; 3. pests;
4. diminished; 5. skeptics; 6. llergic;
7. notwithstanding
B.1. diminish; 2. trait; 3. modify;
4. notwithstanding; 5. alergy; 6. nutrition/
nutrient; 7. revolution; 8. conventional
结尾
Answer Key
Before You Watch
A.1. Answers will vary. 2. Answers will vary.
Other examples may include kimchi, anchovies,
caviar, olives, and liver.
3. Answers will vary.
While You Watch
A. precious; king of fruit; smelly, bad for
business; unique
B.1. compulsory; 2. diligently; 3. diminishes;
4. feasible; 5. contaminated; 6. notwithstanding
After You Watch
A.1.-3. Answers will vary.
第4单元答案
开头
Answer Key
1. Answers will vary, Possible answers include:
Google glass, smartwatches, sneakers that help
you jump higher.
2. Answers will vary. The first clothes were made
from animal skins and furs. Cotton has been
used since around 5000 4000 B.C., silk since
around 4000 B.C., and wool from about 3000
B.C. In the 14th century, advances in dyeing
made clothing more of a fashion item, and
in the 18th century, the Industrial Revolution
initiated the mass production of textiles. The
20th century saw the rise of synthetic fibers
such as nylon and polyester, and there are now
sweat-resistant and even self. cleaning fabrics.
3. Answers will vary. Possible answers include:
3-D printed fabric, new synthetic material,
recycled material.
4A
Answer Key
Before You Read
A.1. draw inspiration; 2. unimaginably complex;
3. have the potential; 4. concrete purpose
B.1. an evolutionary biologist (line 2); 2. it can
drink through its foot (line 13); 3. to create a
device to collect water in the desert (line 20)
Reading Comprehension
1.c2.b (lines 16-17):3. a (lines 74-77);:4.a;
5. a (lines 120-121);6.c;7.d !
Reading Skill
A.1.d;2.b;3.a;4.f,5.c6.e
B.1.a;2.c3.b:4.b;5.a;6.c
Vocabulary Practice
A.1. Nonetheless; 2. insight; 3. device;
4. reproduce; 5. riddle
B.1. vital; 2. gradual; 3. military, 4. vertical;
5. gap
4B
Answer Key
Before You Read
A.1. textiles; 2. high-tech; 3. fiber; 4. synthetic
B. Predictions may vary. Topics mentioned in the
passage are: high-tech protective clothing (lines
23-27); extremely strong fabrics (lines 43- 44);
inelligent clothes (lines 60-104).
Reading Comprehension
1. b; 2. a (lines 35-37); 3. a; 4. d (lines 92 96);
5.c;6. b;7.a
Reading Skill
A.1.a;2.c;3.b;4.a
B.1. always; 2. modern; 3. high-tech; 4. past;
5. protected; 6 women's; 7. future; 8. active;
9. sell; 10. give
Vocabulary Practice
A.1. thereby; 2. fantasies; 3. realities;
4. suspended; 5. forthcoming
B.1.b;2.a;3. a;4.b;5.a
结尾
Answer Key
Before You Watch
A.1. lterally, 2. obstade course; 3. contestants
B. Answers will vary.
While You Watch
A.1.T:2.T:3.F:4.T
B.1. sculpture; 2. engineering; 3. participation;
4. older; 5. obstacles; 6. support; 7. excitement
After You Watch
A.1. and 2. Answers will vary. 3. Possible
answers incude: Hobart Brown feels that the
most important aspect of the race is that people
of all ages can participate. 4. Answers will vary.
第5单元答案
开头
Answer Key
1. Answers will vary (depending on students'
countries). Refer to the map on page 82.
2. Answers will vary. Possible answers include:
DNA samples; ancient artifacts; preserved
fossils and bones. 3. Answers will vary, Possible
answers include: islands and land ma
ses near
the North and South Poles.
5A
Answer Key
Before You Read
A.1. Africa; 2. South America; 3. Asia;
4.40,000-30,000 years ago
B. genetic mutations (lines 39- 43), archeological
evidence (line 92); genetic traces in the DNA of
indigenous people (lines 94-96)
Reading Comprehension
1.c2.a;3. b (ines 80-81); 4. C (lines 7579);
5.a;6. a (lines 92-102); 7. d
Reading Skill
A. and B. (Optional relative pronouns in
parentheses) 1. (that) our ancestors left behind
on their journeys, 2. who lived roughly 150.000
years ago in Africa; 3. which would last tens
of thousands of years; 4. (which) they possess;
5. that had paused in the Middle East; 6. who
crossed from Siberia to Alaska in the last ice age;
7. that is richer and more complex than any ever
written
Vocabulary Practice
A.1. roughly; 2. scattered; 3. immense; 4. bulk;
5. conquered; 6. proof; 7. descendants
B.1. mainland; 2. identical; 3. trace; 4. proof;
5. descendants; 6. conquer
5B
Answer Key
Before You Read
A.1. expanded; 2. anthropologists; 3. canoes;
4. horizon; 5. colonize
B.1.a (page 89); 2. a (page 91);3. b (page91)
Reading Comprehension
1.a;2. b;3.d (lines 52 55); 4. b (lines 107-
110);5. b (lines99 104);6.a;7.c
Reading Skill
A.1.b;2.a;3.c;4.a
Vocabulary Practice
A.1. stretched; 2. intervals; 3. navigated;
4. conceivable; 5. stubborm; 6. disrupts
B.1.a;2.a;3.b:4.b;5.a
结尾
Answer Key
Before You Watch
A.1.-3. Answers will vary. Possible answers
incude: 1. to replicate the past, 2. yes, because
boats similar to this have made great journeys in
the past
While You Watch
A.a.4;b.3;c.1;d.2
B.1. South; 2. Bult 3. modern; 4. ocean;
5. rough; 6. Flooding; 7. drowning; 8. flexible/
strong; 9. Small; 10. boredom
After You Watch
A.1.-3. Answers will vary.
第6单元答案
开头
Answer Key
1. Answers will vary. Possible answers include:
places that aren't very populated. 2. Answers
will vary. Posible answers include: logging,
overfishing, poaching. 3. Answers will vary.
Possible answers include: pass new laws
to protect them, spread the word through
advertising and fundraising. educate people
about the issues.
6A
Answer Key
Before You Read
A.1.T,2.F:3.F:4. T
B. Predictions will vary. Actual answers are:
getting caught in fences (ines 1-2); the loss of
eucalyptus trees (lines 52- -53); dog attacks (line
51); getting hit by vehicles (line 51); disease
(ine 68).
Reading Comprehension
1.b;2. b (lines 17-28); 3. b (ines 33 -37);4. C
(ines61-66):5.b;6.c (lines 116-117); 7.d
Reading Skill
A.1. if they feel threatened (lines 19 -20);
2. it will be taken to the z00 (lines31-33):3.it
will be released near where it was found (lines
33-35); 4. koalas and humans can live together
(lines 61- 63); 5. it can make reproduction
impossible for females (lines 71-75); 6. there's
still hope (ines 123-125)
Vocabulary Practice
A.1. suburban; 2. suitable; 3. devastating;
4. get on board;5. resist
B.1.b;2.a;3.b;4.b;5.a;6.b
6B
Answer Key
Before You Read
A.1.b;2. a; 3. Answers will vary. Possible
answers include: poaching, hunting.
B. An Encounter at Sunset: a description of
Samburu National Reserve; an elephant attack
Saving the Elephants: a short biography of
Douglas-Hamilton; conflict between Douglas-
Hamilton and African authorities
Reading Comprehension
1.a;2.b;3.a;4.c5.c (lines 82-87);6. b
(lines 91-96); 7. d (lines 119-122)
Reading Skill
A. Mwaniki continued to run to camp to get
help. Douglas-Hamilton ran as well, but then
turned back and threw his arms in the air,
yelling. Mwaniki continued to fun to camp to
get help. The elephant didn't stop. Douglas-
Hamilton turned around and ran. The elephant
lifted him up and threw him to the ground. The
elephant tried to stab him with her tusks, but
missed. The elephant Hfted him up and threw
himto the ground
B. a.5 (lines 115-118); b. 2 (lines 77-79);
C.6 (lines 119-126); d.4 (lines 100-106); e.1
(lines 74 76); f. 3 (lines 97-100)
Vocabulary Practice
A.1. withdraw; 2. weapons; 3. agitated;
4. evade; 5. abolish
B.1. agitated; 2. genuine; 3. chaos;
4. withdraw; 5. abolish; 6. evade; 7. collapse;
8. instinct; 9. compile
结尾
Answer Key
Before You Watch
A.1.b;2.a;3.a;4.b;5.a
B. Answers will vary. Possible answers include:
perhaps the elephant and the sheep became
friends because they are both orphans,
While You Watch
A. Numbers from top to bottom:2,5,4.1,3, 9,
10,7.8,6
B.1. protecive; 2. drink milk; 3. don't get
along; 4. "hope"
After You Watch
A.1 and 2. Answers will vary.
第7单元答案
开头
Answer Key
1. Answers will vary. 2. Answers will vary,
Possible answers include: Oftentimes, people find
it dfficult to be in large crowds, and so they may
act in an rritable way by pushing and shoving
others. However, not all people behave like this,
and some people enjoy the community spirit that
a crowd can offter. 3. Answers will vary.
7A
Answer Key
Before You Read
A.1. stampede; 2. Pilgrims; 3. bathe;
4. overcrowded
B.1.b;2.a;3.c
Reading Comprehension
1.c;2.d (lines31-35); 3. C 4. a; 5. a (lines
63-66); 6. d (lines 80-89);7. b (lines 9597)
Reading Skill
A.1. line 7;2. line 8, 3. line 10; 4. line 11; 5. line
13;6. line 16; 7. line 18; 8. line 19; 9. line 20
B.1.b:2.a;3.b;4.b:5.a;6.c;7.c8.c9.b
Vocabulary Practice
A.1. faith; 2. organized; 3. sacred (see Teaching
Notes); 4. prospective
B.1.b;2.a;3.a;4.b;5.a;6. b
7B
Answer Key
Before You Read
A.1.d:2.e;3.b;4.c;5.a
B. Predictions will vary. Answers mentioned in
the passage include: spiritual reasons
(lines 12-13); success in finding food, dothing,
and shelter (ines 17-18); to demonstrate
military power (ines 34 -35); entertainment
(lines 36-37); ethnic afliation and holidays
(line 38).
Reading Comprehension
1. c;2.a (lines 24 -25);3. a (lines 58-63); 4. C;
5.c (lines 97-104); 6. b dines 128-130); 7. d
(lines 107-116)
Reading Skill
A. Prefix only: disappear, ensure, Intermet,
unknown
Suffx only: spiritual, populaity, joyful, religious
Both prefix and suffix: inhabitant, undeniable,
prehistoric, unknowable
Neither prefix nor suffix: people, harvest,
holiday, music
B.1. cent, C; 2. cyd, e; 3. termin, g; 4. nov, b;
5. phon, f; 6. port, a; 7. scrib, d
Vocabulary Practice
A.1. inhabitants; 2. solemnly; 3. undeniably;
4. striking; 5. spinitual; 6. commercial
B.1.b;2.b;3.b;4.a;5.a
结尾
Answer Key
Before You Watch
A.1.d;2.e;3.a;4.c:5.b
While You Watch
A. The following should be checked: create
garlands of flowers; visit temples with their
families; dress up in nice outfits; create pictures
made of sand; share food with neighbors; go
shopping; watch fireworks.
B.1. New Year'sEve Christmas; 2. good light;
3. people'sbodies people's homes; 4. happiness
welcome
After You Watch
A.1.-3. Answers will vary.
第8单元答案
开头
Answer Key
1. Answers will vary. Possible answers include:
DNA testing, CCTV cameras, robotic cameras,
scanners. 2. Answers will vary. 3. Answers will
vary. Famous unsolved mysteries include the
murders committed by Jack the Ripper, and the
death of Napoleon Bonaparte.
8A
Answer Key
Before You Read
A.1. present; 2. Cancer, 3. prisoner, prison
B. Predictions will vary. The fllowing questions
are included in the headings: 1. Political
Murder?: Was Napoleon poisoned by the
British and French royalists?; 2. Poisoned by
His Wallpaper?: Did the wallpaper in his house
contain arsenic?; 3. Doctors' Mistake?: Did the
doctor give him too large a dose of medicine?;
4. Disease?: Did Napoleon have cancer?;
5.A Case of Revenge?: Was he murdered due to
his actions?
Reading Comprehension
1.d;2.a (lines 16- 20); 3. C Cines 40- 44);4. b
(ines36- 44 and 69- -72):5. a;6.d (lines 94-97
and 100 -101); 7. C (lines 109-110)
Reading Skill
A.1.b;2.a;3.aandb;4.a;5. aandc
B. Answers will vary.
Vocabulary Practice
A.1. cease; 2. Symptoms; 3. comelling.
4. dispute; 5. proponent
B.1.a;2.b;3.b;4.b;5.a
8B
Answer Key
Before You Read
A.1. dozen; 2. antidote; 3. Paralysis
B.1.b;2.c;3.a
Reading Comprehension
1.a (lines9 -13);2. d; 3.d (lines 21-25);
4. b (lines 51-52):5.d (lines 67- 77);6.d
(lines 83 -89); 7. b
Reading Skill
A.1.c;2.d;3.h;4.a;5.b:6.g:7.f;8.e
B.1.a;2. a;3.b;4.b;5.a;6.a
Vocabulary Practice
A.1. Frankly; 2. deprived of; 3. in terms of;
4. suspicious; 5. allegations; 6. motive
B.1. suffocation; 2. motive; 3. deprived of;
4. llgation; 5. manipulative; 6. suspicious;
7. candidate; 8. remorse
结尾
Answer Key
Before You Watch
A.1. diversity; 2. toxin; 3. exotic; 4. amphibian
B. 1. She is licking a frog.2. Answers will vary.
While You Watch
A.1.F;2.F;3. T:4. T
B.1. small creatures, 2. samples; 3. poison;
4. helpful; 5. medicines; 6. variety, 7. chemicals
After You Watch
A. Answers will vary. Possible answers include:
1. scorpions, snakes, spiders. 2. Your body takes
in nutrients and chemicals through what you
eat. It's important to eat in a healthy way.
3. To protect the environment and the
indigenous people who live there.
第9单元答案
开头
Answer Key
1. Answers will vary. Possible answers include:
studying ancient ruins and artifacts, reading
about people in the past, looking at evidence
to form theories. 2. Answers will vary,
Possible answers include: with digital scanning
technology, 3-D images. 3. Answers will vary.
9A
Answer Key
Before You Read
A.1. heritage; 2. laser beam; 3.3-D; 4. scan
B. Predictions will vary. The following information
is included in the passage: Rani ki Vavis a
magnificent well built in India in the 11th century.
It was built as a memorial to Queen Udyamat's
dead husband, but had been hidden under sand
since 1300. It was dug out in the 1960s, and
people were amazed at what they found.
Reading Comprehension
1.a (lines 8 -12); 2. C (lines 25 26); 3. b (lines
33- -41);:4. d;5. a (lines 108-115);6. b;7.b
Reading Skill
A.2. Then, during the summer, rain rrives
suddenly and the water seeps down through
the sandy soil. 3. These step wells were simple
at first, but some later became architectural
works of art. Rani ki Vav is among the most
magnificent works of art. 4. There are also
apsaras- -female spirits of the clouds and
water-putting on lipstick or putting on
earings, gazing at mirrors, or drying their hair.
5. A stairway leads to the lowest levels, and a
dark passage leads into the well itself.
B.1. "Wise men talk because they have
something to say; fools talk, because they
have to say something." 2. To err is human,
to forgive is divine." 3. "If you don't love
something. you're not going to go the extra
mile, you're not going to work the extra
weekend, you're not going to challenge the
status quo as much."
Vocabulary Practice
A.1. firsthand; 2. encounter; 3. stunned;
4. garments; 5. gazed; 6. vandals; 7. virtual
B.1.b;2.b;3.b
9B
Answer Key
Before You Read
A.1. Answers will vary. Possible answers include:
discoveries about ancient history and how people
lived in the past; 2. Answers will vary.
B.1. Predictions will vary. Family members of a
great leader were buried there (lines 21-24).
Reading Comprehension
1.c (lines 10-12);2. a (lines 21-26); 3. a (lines
40- 52);4. a;5. d;6. a (lines 101-102); 7. d
Reading Skill
A. Sentences 2 and 3 cannot be reduced.
1. Genghis Khan united a kingdom of tribes
that were at war with each other. 4. This has
led many to the conclusion that his body lies
in a tomb in this zone. 5. One in every 200
men whoare on the planet today is related
to Genghis Khan. 6. It allows us to empower
researchers with tools that they might not have
access to.
B.1. Genghis Khan is a hero to. the people who/
that are living in Mongolia today. 2. The men
who/that were scanning the earth found plenty
of artifacts. 3. They scanned the earth which/
that was near some recently fllen trees. 4. The
research methods which/that he used were
noninvasive.
Vocabulary Practice
A.1. Initial; 2. spotted; 3. accounts; 4. cutting-
edge; 5. took over
B.1.a;2.b;3.a4.b;5. b
结尾
Answer Key
Before You Watch
A.1. timber; 2. solitary; 3. complex; 4. plain
B. Answers will vary.
While You Watch
A.c
B.1.c;2.a;3.b;4.c
After You Watch
A.1. Answers will vary. 2. Answers will vary.
Possible answers include: no theory has been
proven, the history is so ancient, the stone
structure is so massive. 3. Answers will vary.
第10单元答案
开头
Answer Key
1. Answers will vary. Possible answers include:
Astronomers use telescopes and photographs
to study our solar system. NASA (National
Aeronautics and Space Administration) is
an example of an organization which funds
space missions which go to other planets and
beyond. 2. Answers will vary. Possible answers
include: We can leamn more about how Earth
was formed, and potential risks there might
be to our planet. 3. Answers will vary. Possible
answers include; meteors and solar flares.
10A
Answer Key
Before You Read
A.1.T;2.F:3. T;4. NG
B.1.b (lines 14-18):2.a (line 20-23):3.e
(lines 23- 25); 4. d (lines 42- 44);
5.c (lines 116-118)
Reading Comprehension
1. d (lines 71-75);:2. b; 3.d (ines 14-15);
4. b (lines 57-62); 5. d (lines 123-135);
6. b (ine 85); 7.c
Reading Skill
A. and B. Answers will vary.
Vocabulary Practice
A.1. preposterous; 2. spy on; 3. abruptly;
4. layer; 5. spinning
B.1. Squashing; 2. squeeze; 3. vice versa;
4. sprout; 5. spy on; 6. infinitely; 7. abruptly;
8. spinning
10B
Answer Key
Before You Read
A.1. crater; 2. meteorite; 3. diameter
B.1.b (lines 2- 6); 2.d (lines 3941);
3. a (lines 104-112); 4.c (lines 136 141)
Reading Comprehension
1.a; 2.a (ines 18 -22); 3. b (lines 63-66);
4.b;5.c (lines97- 99); 6. d (lines 111-119); 7. C
(lines 147-151)
Reading Skill
A.1.b;2.a;3.a;4.b
B.6. bigger than a sports arena; 3. grapefruit-
sized; 4. the lengthofa car; 2. the size of an
apple; 1. the size of grains of sand;5. as big as a
15-story building
Vocabulary Practice
A.1. collided; 2. drawbacks; 3. scenario;
4. deflected; 5. catastrophic
B.1. rotates; 2. engage; 3. dilemma;
4. atmosphere; 5. motor
结尾
Answer Key
Before You Watch
A.1.d;2.h;3.a;4.c:5.b:6.f;7.g:8.e
B. Answers will vary. Possible answers include:
On Mercury, days are longer than years; Venus
rotates in the opposite direction from all other
planets; The red spot on Jupiter is a storm that
has been raging for a very long time; The rings
on Saturn are made of ice; Uranus was probably
knocked on its side by a ollision.
While You Watch
A.1.a;2.h;3.c4.d;5.f6.e;7.b;8. g
B.1.4.5 bllion; 2.99;3.150; 4.480; 5.70;
6.4;7.1,300;8.1;9. 27; 10. 1,200;
11.7 bllion; 12. bllions
After You Watch
A. Answers will vary.
第11单元答案
开头
Answer Key
1. Answers will vary, 2. Answers will vary,
Possible answers include: they end up in the
dump; they get recycled; they are reused by
others. 3. Answers will vary. If you do not waste
things, you will always have enough.
11A
Answer Key
Before You Read
A.1.2.5; 2.10; 3. farming; 4. faster; 5.5,000
6. the same amount of
B. Spain, India, and South Africa. Predictions
will vary. Answers included in the text are: water
shortages due to wells being dug; lack of rain;
lack of dams; broken water pipes and poor
plumbing.
Reading Comprehension
1.c;2. b;3. b (ines 27-29); 4. a (lines 60-65);
5. d (lines 77-79); 6. d (lines 101-105);7. b
Reading Skill
A.1.a;2.b;3.b;4.c,5.a;6.c,7.b;8.b
B. Answers will vary. There may be differing
opinions on whether first-hand accounts are
more reliable than those of leading authorties.
Vocabulary Practice
A.1. surpass; 2. shortages; 3. leaks;
4. replenished; 5. diverted; 6. whereby
B.1. discern; 2. shortage; 3. replenish; 4. inherit;
5. leak; 6. surpass; 7. dam; 8. dedicated
11B
Answer Key
Before You Read
A.1. lead, PVC, mercury;2. 26.1%
B.1. Answers will vary. The passage discusses
the dangerous substances that waste electronic
products can leave behind.; 2. Answers will vary.
The passage mentions landills and parts being
melted down and recydled.
Reading Comprehension
1.c;2. b (lines 8-11); 3. d; 4. b (ines 57- 59);
5.c (lines 88 95); 6. d (lines 104-109); 7. a
Reading kill
A. Positive: attractive, fortunately, ideal, well-
earned; Neutral: typical, ultimately. secretly;
Negative: arrogantly, elfish, sadly
B.1. - (sadly); 2. + (idea); 3. - (the problem
is); 4. - (unfortunately); 5. - (while .. ethically
questionable); 6. - (itressing)
A. 1. infratructure; 2. piles; 3. discarded;
4. substances; 5. hazardous
B.1.a,2.a;3.b;4.a:5.b
结尾
Answer Key
Before You Watch
A.1. most popular, 2.70; 3. Australia and
Egypt; 4. paper, 5. China; 6.7,000 years ago,
7.27
B.1. Answers will vary. 2. Answers will vary.
Possible answers indude: it is durable;itis soft;
it is comfortable; it is inexpensive. 3. Answers
will vary. Possible answers incude: towels,
carpets, sheets, plastics, cotton swabs, furniture
packing.
While You Watch
A. Cotton is used in food; Cotton has a major
impact on the planet; It takes a lot of energy to
manufacture and transport cotton
B.1.2,700;2.900;3.5;4. 40:5.97;6.2;7.1;
8.70;9. 1/3
After You Watch
A.1. Answers will vary.2. Answers will vary.
3. Answers will vary. Possible answers include:
Take showers instead of baths. Turn off the
faucet while you're brushing your teeth. Use less
water to do the dishes.
第12单元答案
开头
Answer Key
1. Answers will vary. Students may point to a
link between life expectancy and quality of life.
Countries with a high average life expectancy
include Japan, Singapore, Iceland, Sweden,
and Australa. 2. Answers will vary. Students
may highlight differences in areas such as diet,
health, family, and entertainment. 3. Answers
will vary. Posible answers include: healthy diets,
exercise.
12A
Answer Key
Before You Read
A.1. isolated; 2. gene; 3. centenarians;
4. syndrome; 5. Diabetes
B. Answers will vary. The passage mentions
that new information suggests genes are very
important.
Reading Comprehension
1.a;2.c (line 15; line 61; line 87);3. b (lines
35- -37); 4. b (lines51-52);5. a:6. C (lines
94 95); 7. d (lines 105-108)
Reading Skill
A. and B.
1. Asked about the reasons for his long life,
the centenarian smiled and said in Italian,“No
drinking, no smoking, no women."
2. They may have such long lives because ofa
gene that affects their sense of taste.
3. Because of a single gene.
4. Due to a lack of roads, phones, and electricity
until the 1980s.
5.... since he couldn't see through the
windshield.
6.... "because we know we are immune to
cancer and diabetes."
7. Because he broke his leg 88 years ago.
Vocabulary Practice
A.1. passed down; 2. lifespan; 3. slightly
B.1.b,2.b;3.a;4.b;5.a;6.a;7.b
12B
Answer Key
Before You Read
B. Information mentioned in the passage
includes: Food and Drink: tea, red wine, fish,
limited red meat, fruits and vegetables, milk
products, cheese, nuts; Family and Social Life:
hard work, friends, love; Hobbies and Activities:
walking. exercise, swimming, no smoking. yoga
Reading Comprehension
1.c2.a;3.c (lines 75-76);4. b;5.c;6.c;7.c
Reading Skill
A.1. famil; 2. twice; 3. food or diet;
4. lifestyle; 5.4; 6. Californians; 7.86;
8. climate; 9. network
B. Quantitative date includes: Sardinians:91 of
17,865 people born between 1880 and 1900
have lived to 100; rate is more than twice as
high as average Italian; genetics- 80% directly
related to first Sardinians; Adventists: drinking
five glasses of water a day; four servings of nuts;
live 4-10 years longer than average; Okinawans:
lifespan of 78 (men) and 86 (women); lower
cancer and heart disease rates.
Remaining data is qualitative.
Vocabulary Practice
A.1. longevity; 2. lean; 3. barely; 4. guideline;
5. ironic
B.1.b;2.a;3.a;4.b;5. b
结尾
Answer Key
Before You Watch
A.1. deplete; 2. kick in; 3. treadmill; 4. boost;
5. physiological
B.1. Answers will vary. 2. Answers will vary.
Possible answers incude: teenagers because
they have to study for their future jobs; adults
because they have to work to support their
families.3. Answers will vary. Possible answers
include: A lttle stress is good because it helps
motivate, but there should be a balance.
While You Watch
A. The following should be checked: what
adrenaline does to our body; two different types
of stress; tests that show the effects of stress on
the body.
B.1. breathing; 2. levels; 3. stres; 4. physical;
5. chemicals; 6. burn; 7. longevity; 8. exercise
After You Watch
A.1.-3. Answers will vary.
