单选题：It can be inferred from the last paragraph that scientists_

题目分类：卫生类
题目类型：单选题
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题目内容：

It can be inferred from the last paragraph that scientists__________. A．feel relieved by the use of unleaded gasoline
B．are puzzled by the mystery of forest pollution
C．lack sufficient means to combat lead pollution
D．still consider lead pollution a problem

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答案解析：

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分类：卫生类题型：单选题

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分类：卫生类题型：单选题