题目内容

每只蜘蛛有8条腿,蜻蜓有6条腿和2对翅膀,蝉有6条腿和1对翅膀,现有这3种小虫共18只,共有118条腿和20对翅膀,其中蝉的数量为()只。

A. 5
B. 6
C. 7
D. 8
E. A、B、C、D都不正确

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