In January , 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
| A．it marked | B．marking | C．marked | D．to mark |
13．—I think the real－name system for the train tickets can effectively crack down on scalpers（黄牛党）．
— ________. I hate scalpers.
| A．I hope so | B．Believe it or not |
| C．Not at all | D．No way |
12．______the Internet is bridging the distance between people, it may also cause family problems.
| A．When | B．While | C．If | D．As |
11．It was only after he came back___________he decided to write to Kite to find out if he was wasting his time there.
| A．that | B．how | C．and which | D．What |
10．He has recently_______golf to provide himself with some relaxation.
| A．taken on | B．taken off | C．taken up | D．taken over |
9．China Tourism Day should fall on 15th, July, according to Sichuan people,______Deng Xiaoping paid a visit to Mount Emei, and made an important speech on tourism.
| A．which | B．on which | C．of whom | D．Who |