当碳原子数目相同时，所列各物质的苯胺点由大到小排列正确的是（_爱下问搜题

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问题单项选择题

当碳原子数目相同时，所列各物质的苯胺点由大到小排列正确的是（）

A.烷烃>烯烃>单环芳香烃>多环芳香烃

B.多环芳香烃>单环芳香烃>烯烃>烷烃

C.单环芳香烃>多环芳香烃>烷烃>烯烃

D.单环芳香烃>烷烃>烯烃>多环芳香烃

答案

参考答案：A

填空题

若AB∥CD，AB∥EF，则CD______EF，其理由是______．

选择题

—Excuse me, do you know _____?

—It's over there in front of the park. [ ]

A. where is the post office

B. where the post office is

C. where was the post office

D. where the post office was