Scientists will have to（)new methods to increase the world’s food supply

A.within

B.scientists have

C.out what

D.is

(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

A.lead to

B.come up with

C.carry out

D.stick to

groundwork had been laid by scientists years before.

A．little

B．much

C．some

D．any

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

A．cure

B．treat

C．deal with

D．get rid of

A.Not until…have

B.Until…did

C.Not until…do

D.Until…have

with no result.

A．studying

B．researching

C．investigating

D．inspecting

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

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.

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

solve the problem of famine in some places.

A．come up for

B．come down with

C．come down to

D．come up with