振动碾压时为了避免压实层产生水平的细小裂缝应该（）。
A、上行不能振动
B、上行可以振动
C、下行可以振动
D、下行不能振动
参考答案：B, D
Elizabeth Blackwell, who in 1849 became the first woman ever a medical degree in the USA, fought women’s rights bravely.
A．receive; for
B．to receive; for
C．get; against
D．to accept; for
Although he has been studying abroad,his parents try to keep him ________ of what has happened
at home.[ ]
A. warned
B. said
C. reminded
D. informed
