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While other scientists are keeping__ __...

 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

 

B 【解析】这题考查冠词的用法:第一空填an,词组:keep an eye on“密切关注”,第二空不填,是泛指“人类”。选B
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