题目

I had offered to watch my 3-year-old daughter, so that my wife could go out with a friend. I was getting some work done in my study while she________to be having a good time in the other room. No problem, I figured. But then it got a little too________and I shouted, What are you doing? No response. I________my question and heard her say, Oh...nothing. Nothing?I got up from my desk and ran out________the living room, where I saw her running across the hall. I followed and watched her as her little behind made a quick________into the bathroom. I had her________! I told her to turn around. She___下列有关原电池的说法中,正确的是(   )A.铝片和镁片用导线连接后插入NaOH溶液中,镁片较活泼,作负极B.铝片和铜片用导线连接后插入浓硝酸中,铜作负极C.镀锌铁和镀锡铁的镀层破损后,前者较易被腐蚀D.将反应2Fe3++Fe=3Fe2+设计为原电池,则可用锌片作负极,铁片作正极,FeCl3溶液作电解质 
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