【題目】World No Tobacco Day on May 31st, and scientists have had the term “third-hand” smoke introduced to the public．

A. falls B. fell

C. has fallen D. is falling

【答案】A

【解析】考查時態(tài)。句意：世界無煙日定于五月三十一日。根據(jù)句意可知用一般現(xiàn)在時態(tài)，World No Tobacco Day是句子的主語，單數(shù)第三人稱，故答案為A。

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