耙矸机滚筒内钢丝绳缠乱，主要原因是（）、辅助刹车未刹紧。
A.回头轮松动
B.电机反转
C.工作闸把紧
参考答案：B
The youth after 80’s are believed to be selfish and irresponsible, so experts suggest young parents should ____ their children to care about others.
A．bring up
B．bring out
C．bring in
D．bring about
