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[主观题]

Scientists have spent years into the effects of certain chemicals on the human brain, but

with no result.

A．studying

B．researching

C．investigating

D．inspecting

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更多“Scientists have spent years in…”相关的问题

第1题

Only (within) the past 200 years (scientists have) found (out what) fire (is).

A.within

B.scientists have

C.out what

D.is

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第2题

（Leading) scientists are often the （kinds of person) who （have enjoyed) intellectual chall

(Leading) scientists are often the (kinds of person) who (have enjoyed) intellectual challenges (all their lives).

A．Leading

B．kinds of person

C．have enjoyed

D．all their lives

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第3题

With the population explosion, scientists will have to ______new methods of increasing the world’s food supply. （)

A.lead to

B.come up with

C.carry out

D.stick to

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第4题

Even those who had . ______or no training in science might have made their inventions if a

groundwork had been laid by scientists years before.

A．little

B．much

C．some

D．any

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第5题

___ recently ___ scientists known something about AIDS.

A.Not until…have

B.Until…did

C.Not until…do

D.Until…have

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第6题

The article does not say whether the scientists' experiments with dogs have ______.A．benef

The article does not say whether the scientists' experiments with dogs have ______.

A．benefited animals other than dogs

B．served man

C．helped other dogs

D．contributed to medical knowledge

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第7题

Up to now scientists have not found how to ______ patients of that disease.A．cureB．treatC．

Up to now scientists have not found how to ______ patients of that disease.

A．cure

B．treat

C．deal with

D．get rid of

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第8题

According to some scientists, Hemps arepreferable to trees chiefly because [A] they are mo

re easily cultivated. [B] they have been cultivated by manycultures for a long time. [C] they can produce more paper thantrees. [D] they can provide more endurablefibers than trees.

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第9题

Each scientific specialty has its own set of journals. Physicists have Physical Review Let

ters, cell biologists have Cell, neuroscientists have Neuron, and so forth. Science and Nature, (1)_____, are the only two major journals that (2)_____ the complete range of scientific (3)_____. As a result, journalists look (4)_____ them each week for the (5)_____ of new science papers. And scientists look to the journals (6)_____ to reach journalists. Why do they care？ Competition for (7)_____ has gotten so fierce that scientists have sought popular (8)_____ to gain an advantage over their (9)_____. Publication in specialized journals will win the honor of academics and satisfy the publish-or-perish (10)_____, but Science and Nature come with the added bonus of potentially getting your paper written up in The New York Times and other publications.

Scientists are also trying to (11)_____ other scientists through Science and Nature, not just the public. The line between popular and professional notoriety is not (12)_____. Scientists tend to pay more attention to the Big Two than to other journals. (13)_____ more scientists know about a particular pa per, they are more apt to cite it in their own papers. Being often-cited will increase a scientist's "Impact Factor", a measure of how often papers are cited by (14)_____. Funding agencies use the Impact Factor as a (15)_____ measure of the influence of scientists they are considering supporting. (16)_____ Science and Nature papers have more visibility, the number of' submissions is growing, say the editors. Nature now gets 10,000 (17)_____ a year, and that figure is rising, says editor-in-chief Philip Campbell via email. In his opinion, this partly reflects the increase (18)_____ scientific activity around the word. It also (19)_____ reflects the increasing and sometimes (20)_____ emphasis amongst funding agencies and governments on publication measures, such as the typical rates of citation of journals.

A．even

B．though

C．although

D．as if

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第10题

Scientists will have to______new methods of increasing the world's food supply in order to

solve the problem of famine in some places.

A．come up for

B．come down with

C．come down to

D．come up with