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11.World No Tobacco Day       on May 31st,and scientists have had the term"third-hand"smoke introduced to the public.(  )
A.fallsB.fellC.has fallenD.is falling

分析 5月31日是世界无烟日,科学家们已经向公众提出了"第三手"烟的概念.

解答 答案是A.本题考查一般现在时;一般现在时表示通常性、规律性、习惯性、真理性的状态或者动作有时间规律发生的事件的一种时间状态.本题表示的是规律性,即每年5月31日是世界无烟日,故用一般现在时,答案是A.

点评 对时态的选择,要在把握时态的基本用法的基础上,根据具体语境和题干中的时间推断时态,同时关注特殊的结构.

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