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20.His research can serve as ______ valuable reference for the UN to control the spread of EBOLA,______ deadly virus.(  )
A.a,theB.a,aC.the,aD./,the

分析 他的研究能够为联合国控制埃博拉这样一种致命的病毒的扩散提供一种有价值的参考.

解答 答案:B.
考查不定冠词.不定冠词可用在可数名词单数前指其中一个或某一个,根据句意可知his research和EBOLA分别是有价值的参考和致命的病毒中的一种,故选用不定冠词;a valuable reference"一种有价值的参考",表示泛指的意义,a deadly virus"一种致命的病毒",作EBOLA的同位语,表示泛指,故选B.

点评 本题考查不定冠词的用法.不定冠词表示泛指,包括a/an,当单数可数名词以元音字母开头表泛指是用an;定冠词表示特指,用the.

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