[题目]Scientists know the number of birds by .A. do a bird record B. do a bird recordingC. doing a bird record D. doing a bird recording 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】Scientists know the number of birds by ____.

A. do a bird record B. do a bird recording

C. doing a bird record D. doing a bird recording

【答案】C

【解析】句意：科学家通过做鸟类记录知道鸟的数量。考查动名词。By doing sth.：通过做某事；结合句意和语境可知选C。

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