A bottle weighs less after air is taken out, ______proves that air has weight.

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问题 A bottle weighs less after air is taken out, ______proves that air has weight.

选项 A、we
B、it
C、which
D、what

答案C

解析句意：在空气被抽出以后，瓶子的重量减轻了，这证明空气也是有重量的。本题考查定语从句的用法。本句是which引导非限制性定语从句。which指代前面的整个主句所表达的内容。其他选项无此用法。

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