题目内容
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
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题目内容
Air is _________ and of no smell but we can feel its motion when there is a wind．
unavoidable
invisible
inaccessible
unavailable