．在观察草履虫的实验中,用来观察的液滴应取自培养液的（ ）,因为（
．在观察草履虫的实验中,用来观察的液滴应取自培养液的（ ）,因为（
生物人气：414 ℃时间：2020-03-25 04:43:03
优质解答
表层.因为表层含氧量高,食物丰富,因此草履虫较多.
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