— What do you think of the Chinese language today?

— Quite popular. It _____ in communicating with other countries. More and more foreign friends are

     learning Chinese. [ ]

A. plays an important role

B. is playing an important role

C. has played an important role

D. is being played an important role

干草中（）部分营养价值最高。

A.茎秆

B.叶

C.叶柄

D.其它