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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日是世界無煙日,科學家們已經向公眾提出了"第三手"煙的概念.

解答 答案是A.本題考查一般現在時;一般現在時表示通常性、規(guī)律性、習慣性、真理性的狀態(tài)或者動作有時間規(guī)律發(fā)生的事件的一種時間狀態(tài).本題表示的是規(guī)律性,即每年5月31日是世界無煙日,故用一般現在時,答案是A.

點評 對時態(tài)的選擇,要在把握時態(tài)的基本用法的基礎上,根據具體語境和題干中的時間推斷時態(tài),同時關注特殊的結構.

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