2. 外语
  3. A bottle weighs more after air is put in. ______ proves that air has weight.

A bottle weighs more after air is put in. ______ proves that air has weight.

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问题 A bottle weighs more after air is put in. ______ proves that air has weight.
选项 A、We
B、Which
C、It
D、What
答案C
解析 it在这里代表前面所提到的事实。故选C。注意区分A bottle weighs more after air is put in It proves that air has weight.(两个句子)与A bottle weighs more after air is put in，which proves that air has weight(一个句子)。
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