Animals are natural resources that people have wasted all through our history. Animals have been killed for their fur and feathers, for food, for sport, and simply because they were in the way. Thousa 题目和参考答案——青夏教育精英家教网—

题目内容

Animals are natural resources that people have wasted all through our history.
Animals have been killed for their fur and feathers, for food, for sport, and simply because they were in the way. Thousands of kinds of animals have disappeared from the world forever. Hundreds more are on the danger list today. About 170 kinds in the United States alone are considered in danger.
Why should people care? Because we need animals. And because once they are gone, there will never be any more.
Animals are more than just beautiful and interesting. They are more than just a source of food. Every animal has its place in the balance of nature. Destroying one kind of animal can create many problems.
For example, when farmers killed large numbers of hawks(老鹰), the farmers stores of corn and grain were destroyed by rats and mice. Why? Because hawks eat rats and mice. With no hawks to keep down their numbers, the rats and mice multiplied(繁殖) quickly.
Luckily, some people are working to help save the animals. Some groups raise money to let people know about the problem. And they try to get the governments to pass laws protecting animals in danger.
Quite a few countries have passed laws. These laws forbid the killing of any animals or plants on the danger list. Slowly, the number of some animals in danger is growing.
【小题1】Animals are important to us mainly because____.

A．they give us a source of food	B．they are beautiful and lovely
C．they keep the balance of nature	D．they give us a lot of pleasure

【小题2】What has happened to the animals on the earth?

A．Hundreds of kinds of animals have disappeared forever.

B．Many kinds of animals have died out.

C．About 170 kinds of animals have disappeared forever.

D．All kinds of animals are in danger.

【小题3】Which of the following is NOT true?

A．People care much about animals because they need them.

B．Once a certain kind of animals is gone forever, there will never be any more.

C．Killing all rats and mice may cause some problems.

D．People must not kill any animals.

【小题4】What can we infer from the fact that quite a few countries have passed laws protecting animals in danger?

A．Every person will know the importance of protecting wild animals.

B．Animals in danger will not be killed any more.

C．The number of some animals in danger will increase.

D．Animals in danger will be kept away from people.

【小题1】C【小题2】B【小题3】D【小题4】C

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A. people might become lazy as a result of too much sleep

B. there were signs of hibernation in human sleeping habits

C.people tended to sleep more peacefully in cold weather

D. winter was a season for people to sleep for months on end

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A. to set traps to catch animals

B. to wake up their family and neighbours

C. to remind others of the time

D.to guard against possible dangers

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A. Sleep in the way animals do.

B.Consult a doctor if they can’t sleep.

C.Follow their natural sleep rhythm.

D.Keep to the eight-hour sleep pattern.

70.What is the author’s purpose in writing the passage?

A.To give a prescription for insomnia.

B.To urge people to sleep less.

C.To analyze the sleep pattern of modern people.

D.To throw new light on human sleep.

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B．You may get lost when passing through.

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B．built factories near rivers that flowed into the wetland?

C．brought Paperbark to soak up water in Everglades?

D．are cutting down these Paperbark trees?

4.The underlined word "invader" probably means something______. ?

A．that moves in from another place	B．that enters and takes control?
C．that has been brought in?	D．that is in danger?

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A. travels to the Arctic for shrimp in summer

B. spends the winter in the Arctic

C. lives in Hawaii in summer

D. has the same living habits as the caribou

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A. The caribou. B. The bear. C. The squirrel. D. The lemming.

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Research advances over the past decade have told us that, with a little work, we humans can clone just about anything we want, from frogs to monkeys and probably even ourselves!

So, we can clone things, but why would we want to?

Of all the reasons, cloning for medical purposes has the most potential to benefit large numbers of people. How might cloning be used in medicine?

1. Cloning animal models of disease

Much of what researchers learn about human disease comes from studying animal models such as mice. Often, animal models are genetically engineered to carry disease-causing mutations(变异) in their genes. Creating these transgenic（转基因的） animals is a time-intensive process that requires trial-and-error and several generations of breeding（培育）. Cloning technologies might reduce the time needed to make a transgenic animal model, and the result would be a population of genetically identical animals for study.

2．Cloning stem cells(干细胞) for the treatment of diseases

Stem cells are the body's building blocks, responsible for developing and repairing the body throughout life. As a result, they might be used to repair damaged or diseased organs and tissues. Researchers are currently looking up cloning as a way to create certain human stem cells for the research of diseases.

3. Cloning farm animals for drug production

Farm animals such as cows, sheep and goats are currently being genetically engineered to produce drugs or proteins that are useful in medicine. Just like creating animal models of disease, cloning might be a faster way to produce large herds of genetically engineered animals.

1.From Purpose One, we can infer that .

A．most transgenic animals are clone

B．most animals carry engineered genes

C．most transgenic animal models are not cloned

D．most animals carry disease-causing mutations in their genes

2.It can be learned from Purpose Two that cloning technologies can be mainly use do .

A．create damaged or diseased organs and tissues

B．clone genetically defined human stem cells

C．develop and maintain the body

D．repair the body throughout life

3.According to Purpose Three, cloning technologies can be mainly used to .

A．speed up the producing of genetically engineered animals

B．produce drugs or proteins that are useful in medicine

C．raise genetically engineered cows, sheep and goats

D．produce large herds of animals for human beings

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