1、Unit 2 Taskl 【答案】A.elephantschimpanzeesgiraffespenguinskangarooszebraspolar bears.、and a tail. kbig ears廠、 FN、【原文】They live in Africa and India. They have four legs and a tail. They are very big and very strong. They are intelligent, too. They have a trunk and some of them have tusks. They sometimes

2、 live for 70 years.Z . .They live in Africa and Asia. They are brown. They have arms and legs, but they dont have a tail. Their arms are very long and they have big ears. They are good climbers. They are very intelligent, too.They live in Africa. They are very tall. They have four legs, a tail and a

3、very long neck. They eat leaves and twigs. They can run very fast. They are brown and white.They live in very cold countries. They have wings, but they cant fly. They are good swimmers. They eat fish. They are blue and white or black and white.They live in Australia. They are red or gray. They have

4、short frontlegs,longbacklegsanda very long tail. The back legs and the tail are very strong. They can run very fast. The females carry their young in a pouch. /They live in Africa. They have four legs and a tail. They have a beautiful coat with black and white or brown and white stripes. They eat gr

5、ass and plants.They live in very cold countries. They have four legs. They are very big and very strong. They have a white coat. They can swim. They eat seals and fish./ Task 2【答案產(chǎn)A.1) The cheetah.2)170km/h.More than 100 km/h.Because most animals run on four legs.Because we have machines.B.1)F, 2) F

6、, 3)T【原文】The fastest animal on land is the cheetah. It can run at a speed of about 100 kilometres an hour. The fastest bird in the world can fly at 170 km/h, and the fastest fish can swim at more than 100 km/h.Human beings are not very fast. The fastest man in the world can only run at about 40 km/h

7、. Many animals can run faster than this. But most animals run on four legs. Four legs are better than two, arent they? Why do we only have two legs?Scientists say that we are more intelligent than other animals because we stand on two legs, so we can use our hands for other things. We can pick thing

8、s up with them. We can use tools. Human beings have used tools for millions of years. That is why our brains have developed. That is why we have become the most intelligent animals in the world.In the past few years, we have made all kinds of machines. We have made cars, ships, aeroplanes and spacec

9、raft. In these machines we can travel faster than any animal 一by land, by sea, or by air. We can even go to the moon. No other animal has ever done that! TOC o 1-5 h z HYPERLINK l bookmark18 o Current Document Task 3. k HYPERLINK l bookmark20 o Current Document 【答案】二 HYPERLINK l bookmark28 o Current

10、 Document A.二Climate, lack offood and aliens from outer space might be responsible for their extinction.No.N；B./，I：B: might have gotten, killed them offA: may have run out of foodB: could have been destroyed by aliens HYPERLINK l bookmark22 o Current Document 【原文】fI；/A: You know,were studying dinosa

11、urs in science class. Ifs really interesting.B: Oh, yeah? Hey, have you learned why the dinosaurs disappeared?A: Well, no one knows for sure.B: I thought it had something to do with the climate. The temperature might have gotten cooler and killed them off.A: Yeah, thats one theory. Another idea is t

12、hat they may have nn out of food.B: Uh- huh. And you know, theres even a theory that they could have been destroyed by aliens from outer space.A: That sounds crazy to me!；Task 4【答案The mayfly. A few hours.They just do two things: finding a mate and producing young.We could judge by its growth rings.I

13、t was kept for 152 years.【原文】For the shortest life, the first prize must go to the mayfly, which typically lives only a matter of a few hours after it emerges from its shell. F ew mayflies live to see the sun rise again. These creatures devote their whole lives to a single desperate mission: finding

14、 a mate and producing young. They dont even have functional mouths and stomachs. They simply have no time to eat. In fact they have no time for anything else.The record-holder for the longest life may be the Arctic clam, one of which lived quietly underwater for220 years. However it did not have any

15、 birth certificate to prove this. One could only judge by its growth rings.If you insist on better documentation, the oldest animal ever was probably a tortoise that died in 1918. It had been captured already full-grown in 1766, nine years before the American Revolution began and it died 152 years l

16、ater as World War I came to a close.Task 5【答案】A.People have different opinions on using animals for research.B.forwas tried first on animals.is dependent onusing unwanted animals.against. ?：*. :sufferunnecessary； R?；the same rights0cell culturecomputer modeling.【原文】/ I；/Every year about 17 million a

17、nimals are used in Laboratory experiments. But in many countries today, a difficult question is being asked: Do we have the right to use animals in this way?People who are for using animals in research argue that the use of animals in medical research has many practical benefits； Animal research has

18、 enabled researchers to develop treatments for many diseases, such as heart disease and depression. It would not have been possible to develop vaccines for diseases like smallpox and polio without animal research. Every drug anyone takes today was tried first on animals.Future medical research is de

19、pendent on the use of animals. Which is more important: the life of a rat or that of a three-year-old child?Medical research is also an excellent way of using unwanted animals. Last year, over 12 million animals had to be killed in animal shelters because no one wanted them as pets.However those who

20、 are against it point out that the fact that humans benefit cannot be used to justify using animals in research any more than it can be used tojustify experimenting on other humans. Animals suffer a lot during these experiments. They are forced to live in small cages, and they may be unable to move.

21、Much of the research that is carried out is unnecessary anyway.Animals have the same rights as humans do -to be able to move freely and not to have pain or fear forced on them. Researchers must find other ways of doing their research, using cell culture and computer modeling. There should be no anim

22、als in research laboratories at all.Task 6【答案】A.No.Because zoo officials want him to produce cubs with another female tiger, so they don 51 want him to become too interested in this family.B.four months13 kilogramshorse meat, their mothers milk.the National Zoos WebsiteC.l)c, 2) c, 3)b【原文】Visitors t

23、o the National Zoo in Washington D. C. can see three new young tigers. The rare babies met the public for the first time late last month. Chip ONeal tells us about them.、The mother tiger sat nearby on the grass as her babies rolled, chased and bit each other playfully. Then Korenchy alsojumped into

24、the games. Her cubs were born at the zoo four months ago. They are called Mike, Eric and Chrisy. The new young tigers at the National Zoo each weigh about 13 kilograms. Their fur is dark orange with black stripes. They eat horse meat and drink milk from Korenchy.Korenchy and her babies are Sumatran

25、tigers. Sumatran tigers came from the Indonesian island of Sumatra. They are now in danger of disappearing from the earth. F ewer than 500of these tigers remain in the world. That includes about 60 living in zoos in North America.Korenchy came to the National Zoo from the Jakarta Zoo in Indonesia. T

26、he girl was part of the Sumatran Tiger Species Survival Program. Korenchy has given birth to live cubs three tines. The father ofher new cubs is Rokan, a Sumatran tiger who arrived two years ago from another zoo. Korenchy and Rokan had their babies the natural way instead of the scientific method of

27、ten used to produce young animals in zoos.A wire fence separates Rokan from his babies. Zoo workers who care for Rokan say he reaches through the fence to wash the cubs with his tongue. They say this means he recognizes Mike, Eric and Chrisy as his cubs. However, zoo officials are hoping that Rokan

28、will produce more cubs with another female Sumatran tiger at the zoo, so they do not want him to become too interested in this family.The National Zoo hopes to keep the Sumatran tiger cubs for at least 18 months before sending them to otherzoos. That is about the age when most tiger cubs in the wild

29、 leave their mothers. The National Zoo has placed cameras in the Sumatran tigers? living area, so people with computers can see them. Todo this, use your computer to find the National Zoos Website at /natzoo.Task 7【答案】A.Cats have been more popular, because there are more pet cats in American h

30、omes.About 8,000 yearsThey probably arrived in the United States from Europe.No.B.food especially prepared for catsother equipmentwith images of catsin special burial groundspleasurecarebeing aloneindependent TOC o 1-5 h z C.、1)F, 2) F, 3)T, 4) F, 5) F三。【原文】An old expression says, Mans best friend i

31、s his dog. Today, however, it seems that cats have replaced dogs as the most popular pets in American homes.Americans have more than 62 million pet dogs. But even more cats more than 64 million 一 live in American homes./ .JThese pet cats may have long hair or short hair. They are different colors an

32、d sizes. Some are costly animals that take part in competitions. Many more are common American mixtures of several kinds of cats.Most house cats live a good life. They are not expected to work for their food. Instead, they rule their homes like furry kings and queens. They wait for their owners to s

33、erve them.Americans are increasingly serious about their cats. These concerns have made the care of cats into big business.Each year, cat owners buy tons of food especially prepared for cats. They buy toys and other equipment. They buy jewelry and clothes for themselves with images of cats on them.

34、Some owners even bury their dead pets in special burial grounds.Humans have loved and respected cats for centuries. Scientists have evidence that cats and people lived together as long as 8000 years ago. The small house cat was once a highly honored animal. In ancient Egypt, for example, people who

35、killed a cat could be punished by death.Early in American history cats were not treated as gods, however. They probably arrived in the United States with settlers and traders from Europe. These cats worked. They killed rats and mice.Sometimes, Americans mistreated their cats. During the early days o

36、f the nation, religious extremists believed that some cats were working for the devil. Black cats were especially suspected of being evil.Later, American families who had enough food began taking cats into their homes. People cared for the cats because the animals gave them pleasure. The cats thanke

37、d people for feeding them by making a purring sound. This pleasant noise usually means a cat is happy.Animal experts offer several reasons why cats have become so popular as house pets. They say cats need less care than dogs. And cats do not seem to suffer as much as dogs from being alone if the owners are away.Still, millions of other people do not like cats at all. They say dogs are better and more loving pets. They say cats do not have much feeling. They believe cats stay with people only to be fed. Cat owners defend their pets against such criticism. They say cats are just much more in