Air is composed of______ gas including hydrogen, oxygen and carbon dioxide.

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问题 Air is composed of______ gas including hydrogen, oxygen and carbon dioxide.

选项 A、varied
B、variant
C、variable
D、various

答案D

解析 本题的大意是空气是由氢气、氧气和二氧化碳等各种各样的气体组成的。四个选项中,varied多变化的,多用于修饰可数名词:variant不同的,变异的,多用作名词,variable易变的,反复不定的,various 各种各样的,许多的。
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