---What do you think of his talk on Information Technology? 

---Oh, excellent. It's worth ________．

A．listening to

B．being listened to

C．listening of

D．to be listened to

在推广本国语言文化方面，国际惯例是( )。

A．请世界名人书写院名

B．由总统担任推广大使

C．由专门机构承担重任

D．为学习者建立大联盟