单选题：paragraph 4________

题目分类：理工类
题目类型：单选题
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题目内容：

paragraph 4________ A．What are noble gases?
B．what is the periodic table?
C．What causes the low chemical reactivity of noble gases?
D．How were noble gases discovered?
E．How were noble gases understood in the past?
F．What are the applications of noble gases?

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答案解析：

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