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Air, which (it is) a mixture of elements oxygen and nitrogen (and compounds) wat
Air, which (it is) a mixture of elements oxygen and nitrogen (and compounds) wat
游客
2024-01-05
20
管理
问题
Air, which (it is) a mixture of elements oxygen and nitrogen (and compounds) water and carbon dioxide, also (contains) small quantities of (many other) substances.
选项
A、it is
B、and compounds
C、contains
D、many other
答案
A
解析
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