Animals are obviously lower form of life than man. A. a ; / B. the ; the C. a ; the D. / ; / 题目和参考答案——青夏教育精英家教网—

题目内容

Animals are obviously ______ lower form of life than _______ man.

A. a ; / B. the ; the C. a ; the D. / ; /

A.考查冠词用法。不定冠词与可数名词单数用在一起可表示类别；man当“人，人类”讲时，单独使用。因此正确答案为A.

【句意】很显然，与人类比起来，动物是较低级的生命形式。

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67.The example of the French peasants shows the fact that________.

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

68. The late night was called “The Watch”because it was a time for people______.

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

69. What does the author advise people to do ?

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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1.Which helps to explain why it is difficult to travel in Everglades?

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B．You may get lost when passing through.

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D．They can watch alligators without hurting them. ?

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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?

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A．that moves in from another place	B．that enters and takes control?
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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. use up their fat layer B. find food C. protect themselves D. hunt in packs

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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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