—Mary told me she would ________ computer studies.

—Really? I’ll try my best to ask her to_________ such foolish ideas.

A．pick up; give up

B．put away; give up

C．give up; put away

D．give up; pick up

架空电力线路跨越架空弱电线路时，其交叉角对于一级弱电线路应（）。

A.<30^o

B.≥30^o

C.<45^o

D.≥45^o