Paragraph 4__________________．
根据以下资料，回答下面的题目。 Paragraph 2__________________．问题
Paragraph 4__________________．
参考解析：
第四段主要讲述惰性气体的化学性质稳定，是因为最外层电子满足稳定结构。所以D选项What cause the low chemical reactivity of noble gases?“惰性气体化学性质不活跃的原因”正确。
分类：职称英语,外语考试
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