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文件操作命令；1.创建文件77、44、11；2.将文件77复制为文件777；3.将文件44修改为文件444；4.将文件77、444、111删除。（23.4分）

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At the modern Olympics, each first-place winner receives a gold medal, each second-place winner receives a silver medal, and each third-place winner receives a bronze medal (the bronze medal was introduced in 1904). Different medals are designed for each new Olympics.The 2012 Summer Olympics are in London, England, Great Britain. The opening ceremonies will be on July 27, 2012. The closing ceremony will be on August 12, 2012. The motto of the London Olympics is 'Inspire a generation'.

1. This is really an exciting match. ___ the game?A. Who do you think will win B. Whom do you think will winC. Do you think who will win D. Do you think whom will win2. the playground, we learned that the basketball match had already begun.A. Arrive at B. To arrive C. Arriving at D. Arrive3. The first Olympics in modern times _ in 1896A. was taken placeB. were happened C. was held D. were held4. Lilei and Limingimprove their game, they’re going to lose the match.A. Unless B. When C. If D. Whether5. is your favoriate sports?A. what B. who C.whenD. why6. During the last summer vacation, all the football playershad plenty of and got a lot of practical in the team.A. exercises; experiences B. exercises; experienceC. exercise; experiences D. exercise; experience7. ------Would you mind my telling him the news? ----_.A. Yes, please B. Never mind C. It doesn’t matter D. No, go ahead8. I think you’d better ______your spare time better.A. employ B. share C. make use of D. hire9. _do you usually play with?A. who B. which C. what D. why10. ------Would you like to play basketball with me this afternoon?------___________.A. I have no idea.B. It’s a pleasure.C. Well, I feel like staying at home.D. No way. I’ll do my homework

Reading Comprehension.AOnce a group of 17-year-old schoolboys decided to break the world basketball marathon record(马拉松记录). They wanted to play for ninety hours and that is to add six hours to the record. Each team had nine players, with five at a time. The boys decided each person would play 21. 5 hours and then rest for 2 hours. Then they started at 6 o’clock in the evening.The first night was very hard for the players. When it was their turn to rest, they were too excited(兴奋的) to fall asleep at once.After sleeping for a short time, they had to play again. On the second night, they fell asleep as soon as they stopped. Some of them had trouble with their feet and hands, but the only serious problem was a psychological(心理上的) one. Each boy was thinking：why am I doing this？How can I play any longer？After the third night, the players knew they could finish the ninety hours. The basketball on the fourth night was very slow. But in the final hours, the players got better. For the last few minutes, the players looked as fresh as when they started. How happy everyone was！1. In the story, there were ___ schoolboys playing basketball marathon.A. 18 B. 17 C. 14 D. 192. Before this basketball marathon, the world record was _.A. 96 hours B. 86 hours C. 90 hours D. 84 hours3. The first night was hard for the players to fall asleep because _.A. it was very long B. they only slept for a short timeC. no one watched them play D. they were too excited4. “…the players looked as fresh as when they started” here “fresh” means ___.A. 新鲜的B.精神饱满的C兴奋不已的 D. 伤痕累累的5. Which of the following sentences is wrong？A. Some of the boys were hurt when they played.B. In the end, all the boys felt happy.C. The boys started playing at 6 o’clock in the evening.D. It was hard for the players to fall asleep at night.

纳米乳属于 ( )

A. 胶体分散体系
B. 粗分散体系
C. 微粒分散体系
D. 分子分散体系
E. 以上都不对