选择题:In the common interest of protecting the nature, a

题目内容:
In the common interest of protecting the nature, a lot of governments have been united to abolish the ____pollution caused by chemical industry.(poison)
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是市场调查中搜集资料的最常用方法( )

是市场调查中搜集资料的最常用方法( ) A.抽样调查 B.问卷调查 C.访问调查 D.实验调查

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