2. 外语
  3. (A) container (weighs) more after air (is put) in, (it) proves that air has weight.

(A) container (weighs) more after air (is put) in, (it) proves that air has weight.

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问题 (A) container (weighs) more after air (is put) in, (it) proves that air has weight.
选项 A、A
B、weight
C、is put
D、it
答案D
解析 应改为which。本题考查的是定语从句。两个句子用逗号连接，没有连接词，且后面的句子缺少主语。所以前面整句话作为后面句子的主语，引导词用 which。放进空气以后，容器变得重了，这证明空气是有重量的。
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