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That is where Lu Xun used to live.()

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He understood what he was talking about.()

Do you remember the teacher who taught us English at middle school?()

I wonder why she refused my invitation.()

将物质A与B混合,发现反应按下述机理进行:(1) A + B → C;(2) B + C → D + E + A ,下列说法正确的是

A为反应的中间产物
B. A为反应的催化剂
C为反应的催化剂
D. A为反应的产物

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