问题
选择题
Air is ________ and of no smell but we can feel its motion when there is a wind.[ ]
A. unavoidable
B. invisible
C. inaccessible
D. unavailable
答案
答案：B
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Air is ________ and of no smell but we can feel its motion when there is a wind.[ ]
A. unavoidable
B. invisible
C. inaccessible
D. unavailable
答案：B