36、H1N1 control and prevention is a        to Mexico as well as the whole world.

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

36、B

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科目：高中英語 來源： 題型：

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

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

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科目：高中英語 來源：黑龍江省哈師大附中2008－2009學(xué)年下高一六月考英語試題 題型：014

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

[　　]

A．surprise

B．challenge

C．reaction

D．threat

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