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H1N1 control and prevention is a to Chin...

H1N1 control and prevention is a    to China as well as the whole world.

    A.surprise        B.challenge        C.reaction        D.threat

 

B 【解析】本题考查名词辨析。句意:H1N1的预防与控制对中国以及整个世界来说都是一种难题。challenge 挑战;艰巨的事;threat to对…威胁,surprise to出乎…的意外, reaction to 对…的反应。
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