What’s the article mainly about? Since air is a gas, it has ______.

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问题 What’s the article mainly about?
Since air is a gas, it has ______.

选项 A、both room and shape
B、shape as well as weight
C、either shape or weight
D、no definite shape

答案D

解析由文章第二段第一句可知空气是没有形状的，关于重量方面的情况、，文章中并没有提到。

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