精品文档。1欢迎下载三、完形填空 . A We live in the computer age. People use computers __21____much of their work. But few people know how ____22____ after them. Remember the following when you use your computer. ____23___ your computer in a cool and dry room. Too much or too little heat is bad for computers. Damp(潮湿 ) is also bad for ____24____. Do not let people ___25______ near your computer. Smoke of all kinds is very bad for many parts of a computer. Do not eat ____26__ drink when you are near your computer. Pieces of food and a little water in the keyboard(键盘 )___27_______ also bad for a computer. Keep your screen ____28____ and do not make it too bright. It’s bad for your eyes. Make sure the screen is not too far ___29____ or too near to your eyes. Some people use ___30____ when they use a computer. ( ) 21. A. do B. to do C. doing D. to doing ( ) 22. A. look B. looking C. to look D. to looking ( ) 23. A. To keep B. Keeping C. Keep D. Keeps ( ) 24. A. them B. their C. they D. theirs ( ) 25. A. smoking B. smokes C. smoke D. to smoke ( ) 26. A. so B. nor C. but D. or ( ) 27. A. are B. is C. was D. were ( ) 28. A. cleans B. cleaning C. clean D. to clean ( ) 29. A. to B. from C. of D. between ( ) 30. A. a different glass B. different glass C. the different glass D. different glasses (B ) Chinatown, in the San Francisco, the USA is the oldest Chinatown in North American. It is one of the top tourist attractions in San Francisco. Let’s 41 through Chinatown .It is twenty -four blocks in size. In the streets you can hear 42Chinese than English. The center of Chinatown is Stockton Street. It has Chinese fish, fruit and vegetable markets,...
