单相有功电能表一般为（），就是该客户的用电量。

A.本月读数

B.上月读数

C.本月读数与上月读数之和

D.本月读数减去上月读数之差

It is required that the students ________ mobile phones in their school, so seldom ________ them using

one.[ ]

A．not use; will you see

B．should not use; you will see

C．don't use; will you see

D．not use; you will see