单选题：A big problem of solid waste disposal is that____。

题目分类：理工类
题目类型：单选题
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题目内容：

A big problem of solid waste disposal is that____。 A．solid waste are poisonous
B．it is difficult to find places to dispose of solid wastes
C．the disposal process is too backward
D．we don't have enough manpower to dispose of solid waste

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