单选题：People tend to ignore the delayed effects of exposure to che

题目分类：理工类
题目类型：单选题
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题目内容：

People tend to ignore the delayed effects of exposure to chemicals because____. A．limited exposure to them does little harm to people's healt
B．the present is more important for them than the futur
C．the danger does nobecome apparent immediatel
D．humans are capable of withstanding small amounts of poisonin

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答案解析：

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分类：理工类题型：单选题

The investment can be regarded as efficient____.

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分类：理工类题型：单选题