H1N1 control and prevention is a   to China as well as the whole world．
A．surpriseB．challengeC．reactionD．threat
B
本題考查名詞辨析。句意：H1N1的預(yù)防與控制對(duì)中國以及整個(gè)世界來說都是一種難題。challenge 挑戰(zhàn);艱巨的事；threat to對(duì)…威脅，surprise to出乎…的意外， reaction to 對(duì)…的反應(yīng)。
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