冬季顶送车辆时，作业人员不得有哪些行为？
参考答案：不得间断暸望，不得背脸、闪身。
She thought I was praising her child，_____，in fact，I was scolding him for his bad behaviors at school.
A．what
B．while
C．so that
D．therefore
作图说明大国征收进口关税的经济效应。
