【題目】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：科學(xué)家通過做鳥類記錄知道鳥的數(shù)量�？疾閯用~。By doing sth.：通過做某事；結(jié)合句意和語境可知選C。

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