【題目】The WHO has given some advice on to prevent us being infected(感染)with H7N9.

A. how B. what C. where D. when

【答案】A

【解析】

試題分析:句意:WHO已經(jīng)給出一些怎樣使我們免受H7N9的建議。A. how怎樣;B. what什么; C. where 哪里; D. when什么時(shí)候,根據(jù)句意是“怎樣”,所以選A。

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