单选题：What is the purpose of the experiment mentioned in this pass

题目分类：理工类
题目类型：单选题
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题目内容：

What is the purpose of the experiment mentioned in this passage? A．To propose measures to hold back environmental deteriorating.
B．To predict environmental deteriorating that can cause vast destruction．
C．To limit the destruction that environmental deteriorating may cause．
D．To see if humans can engineer systems providing life-supporting services

参考答案：

答案解析：

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