Due to the influenza A, all travelers returning from South America are being checked______infections.

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问题 Due to the influenza A, all travelers returning from South America are being checked______infections.

选项 A、of
B、for
C、from
D、about

答案B

解析词汇：介词1．这是一道词汇题。选项均为介词。2．这是一个被动语态的句子，原文意思是“接受infection(感染)检查”，因此(B)for为正确选项。

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