— Could you please tell us about some good ways to learn English?

— My suggestion is that reading often and writing regularly _____. [ ]

A. are needed

B. is needed

C. be needed

D. should need

带冲突检测的载波监听多路访问技术，简称是（）。

A.CDMA

B.CSMA

C.MDAS

D.MSAD