英语三级B级
A．We
B．Which
C．It
D．What
【译文】瓶子装入气体后会增重，这说明气体是有重量的。
【考点】it的用法
【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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