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【题目】The scientist has done several ________ to find out the reasons for the strange.

A.standardsB.stepsC.gamesD.experiments

【答案】D

【解析】

句意:这位科学家做了几项实验来找出这种奇怪现象的原因。

考查名词。standards标准;steps台阶;games游戏;experiments实验;根据“The scientist”可知是科学家,结合后面是找出这种奇怪现象的原因,可推测出此处是“实验”,故选D

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