发动机修理中利用率和工作效率较高的是（）扳手。
A.活动
B.套筒
C.开口
D.链条
参考答案：B
It is well known to us all that a lot of rivers _______by factories.
A．are polluting
B．have been polluting
C．are being polluting
D．are being polluted
乙女未提起上诉，上诉期间已过，报社是否可以不等二审判决结果而向法院申请对她单独执行一审判决为什么
