----What do you think of the Chinese language today?

---- Quite popular. It __________ an important role in communicating with other countries. More and more foreign friends are learning Chinese.

A．plays

B．played

C．has played

D．will play

工作票签发人的安全责任是：（）

A、所派工作负责人和工作班人员是否适当和充足

B、工作的必要性和安全性

C、负责检查检修设备有无突然来电的危险

D、工作票上所填安全措施是否正确完备