单选题
Why does the shark never stop moving?
A、
It never sleeps.
B、
It can only smell when moving.
C、
If stopped it would sink.
D、
It must eat constantly.
【正确答案】
C
【答案解析】
参照文章第四段的内容,“Unlike most fish,it has no air bladder,and it must move constantly to avoid sinking.”鲨鱼之所以不停的游是为了防止下沉。
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