Scientists know that there are two basic approaches to prolonging for life. One approach i

第1题

Do scientists know how many cryptic species exist？A．Not yet.B．Yes, they do.C．They will kno

Do scientists know how many cryptic species exist？

A．Not yet.

B．Yes, they do.

C．They will know the answer in another one or two years.

D．They will never know the answer.

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第2题

英译中It is entirely reasonable for auditors to believe that scientists who know exac

英译中

It is entirely reasonable for auditors to believe that scientists who know exactly where they are going and how they will get there should not be distracted by the necessity of keeping one eye on the cash register while the other eye is on the microscope.

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第3题

______ scientists haw learned a lot about the universe， there is much we still don‘t know

A.A.Once

B.B.Since

C.C.Though

D.D.Unless

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第4题

Now scientists know ______.A．what makes people feel cool near a lake or an ocean in summer

Now scientists know ______.

A．what makes people feel cool near a lake or an ocean in summer

B．everything about the ocean

C．why the ocean does not get more and more salty

D．what happens to the salt in the ocean

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第5题

How do scientists know Motherhood may make women smarter（）

A．Some researchers have told them

B．Many women say so

C．They know it by experimenting on rats

D．They know it through their own experience

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第6题

Scientists didn’t know much about lung cancer _____.

A、before long

B、until recently

C、long before

D、in the past few years

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第7题

Scientists resist talking about their options because they don't want people to

A know what they are doing.

B feel their efforts are useless.

C think the problem has been solved.

D see the real problem.

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第8题

Why do scientists know black holes exist（).

A、They are much larger than other stars.

B、They exert a force of gravity on other stars.

C、They are visible with special telescopes.

D、It is possible to calculate their mass and energy.

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第9题

People are confused in their attempts to control malaria in Europe in the early 1900s, bec

ause scientists ______.

A．identified only one mosquito species instead of six species

B．thought only three mosquito species transmitted disease

C．thought there was only one mosquito species

D．did not know what species was being studied

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第10题

根据以下内容回答题：Scientists know that there are two basic approaches to prolonging life（

根据以下内容回答题：

Scientists know that there are two basic approaches to prolonging life（延长寿命），one approache is the elimination of the diseases that generally affect older people—diseases such as cancer，heart attack and stroke．（1）is the delay of the process of growing-old the（2）of the body． In recent years scientific researchers（3）much time in the study of the process of aging．They believe that，within a few years，they will develop the knowledge and the（4）to delay the aging process for lo to 15 years．The result will be that more people will live longer，more healthful lives．At present，scientists believe that with the right diet，exercise，medical（5），and mental attitude many people can live to he l00 years old． Gerontologists（老年学专家），people who（6）studies of the problems of growing old，are investigating（7）body cells slow down and（8）die．They feel that delaying this slowing down process（9）help postpone death．In a number of American universities，scien-tists are studying the activity of cells，the effects of diet and internal body temperature on aging．If their studies are successful，the results should help（10）the quality of life for older people in the next few years，as well as increase the life span of the next generation．

1.

A.Others

B.Another

C.The other

D.One more

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第11题

Scientists hope that if we can discover __1__ the brain works, the better use we will

be able to put it to. For example, how do we learn language？ Man differs most from all the animals in his ability to learn and use language __2__ we still do not know exactly how this is done. Some children learn to speak and read and write when they are very young compared to __3__ children. But scientists are not sure why this happens. They are trying to find out __4__ there is something about the way we teach language to children which in fact prevents children __5__ learning sooner.

1)、A.but

B.how

C.from

D.whether

E.average

2)、A.but

B.how

C.from

D.whether

E.average

3)、A.but

B.how

C.from

D.whether

E.average

4)、A.but

B.how

C.from

D.whether

E.average

5)、A.but

B.how

C.from

D.whether

E.average

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