While other scientists are keeping____eye on changes in the H5N1 bird flu strain

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While other scientists are keeping____eye on changes in the H5N1 bird flu strain, the scientists in England are working on vaccines, in case it becomes highly infectious in ____humans.

A．a , /

B．an, /

C．the, an

D．an, the

答案

解析

考查冠词。句意“其它科学家正在密切观察H5N1流感病毒的变化，而英国的科学家正在致力于疫苗的研究，以防止出现病毒演变成对人类具有高传染性的危险。”keep an eye on sth.“注视......”；humans“人类”，前不用冠词。故选B。

举一反三

We are now living in ______ “Information Age”, ______ time of new discoveries and great changes.

A．the; a

B．an; the

C．不填; a

D．the; the

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The beauty of nature shocked the trave11ers, and many of them have got new experience from the travel.

A．×、×

B．the, a

C．the、×

D．×、a

题型：不详难度：| 查看答案

Mr. White graduated from _____ Cambridge University with a degree in ____ physics.

A．the; a

B．a; a

C．a; the

D．/; /

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Wouldn’t it be ______ wonderful world if all nations lived in ____ peace with one another?

A．a ; /

B．the ; /

C．a; the

D．the; the

题型：不详难度：| 查看答案

His grandparents were born in ______ Qing Dynasty, while he was born in ______ 1920’s.

A．a; an

B．/;the

C．the; the

D．a; the

题型：不详难度：| 查看答案