单选题：According to the passage, which of the following would worry

题目分类：理工类
题目类型：单选题
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题目内容：

According to the passage, which of the following would worry the critics the most? A．The unanticipated explosion of population.
B．The creation of biological solar cells.
C．The accidental spill of oil.
D．The unexpected release" of destructive microbes.

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答案解析：

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