题目内容

氧化还原反应中，获得电子的物质是剂，自身被；失去电子的物质是剂，自身被。

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有下列原电池:(-)Zn|Zn2+(mol·L-1) ||Cu2+(mol·L-1)|Cu(+)，该原电池的负极反应为；正极反应为。

Who ________ the bicycle?

A. invented
B. has invente
C. invents
D. had invented

I was unhappy because the trip was cancelled. I ___________ forward to it.

A. was looking
B. am looking
C. has been looking
D. had been looking

I'm looking for Paul. _________ him?

A. did you see
B. have you seen
C. had you seen
D. were you see