几个英语单选问题要详解（急）!
2.During _______ trip to Yunnan,Premier Wen Jiabao stressed ______importance of water conservation projects and promised more government support.
A.the ;the B.the；不填 C.a；不填 D.a ; the
3._____ every day,the Internet provides readers with the latest news from all corners of the world.
A.Update B.To update C.Updating D.Updated
11.Leaders of many countries have been trying to _____ what it is that makes China develop so fast in recent years.
A.carry out B.figure out C.watch out D.make out
17.—Are you sure the delegation will come to our school next week?
— ______.The head of it has just emailed me about the departure time of their flight.
A.No wonder B.Definitely not C.Don’t mention it D.You bet