报告的正文一般是由( )等部分构成。
A．报告原因
B．报告内容
C．报告导语
D．报告结束语
参考答案：B,C,D
You must be very tired. Why not ______ a rest?[ ]
A. stop having
B. to stop having
C. stop to have
D. to stop to have
煤电钻的电源是220V。
