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听力原文：W：What a terrible thing! The crazy man picked up a large stone and threw it at the store window．There was glass everywhere． M：I hope no one was hurt． Q：What is the man concerned about? (16)A.
The loss of the store.
B.
The possible harm to the people nearby.
C.
The punishment to the crazy man.
D.
The reason for the crazy action.
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【简答题】C51单片机的定时计数器,会在时钟的驱动下,每一个时钟沿加1计数,并在( )时设置中断标志。
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