The computer is fast, and never makes a mistake, while people are too slow, and full of mistakes sometimes. That’s __36__ people often say when __37__ talk about computers. For over a quarter of a century, scientists have been __38__ better and better computers. Now a computer can __39__ a lot of __40__ jobs wonderfully. It is __41__ used in factories, hospitals, post offices and airports. A computer can report, decide and control in almost __42__ field. Many computer scientists are thinking of __43__ the computer “think” like a man. With the help of a person, a computer can __44__ pictures, write music, talk with people, play chess, recognize voices, translate languages and so on. Perhaps computers will __45__ really think and feel. Do you think the people will be afraid __46__ they find that the computer is too clever to listen to and serve the people? No, people will __47__ better use of the computers in __48__ future. Man is __49__ the master（主人） of the computer. The computer works only __50__ the help of man. It cannot take the place of (取代) man.

(     )36. A. that                B. what            C. how                  D. why

(     )37. A. we                 B. they             C. you            D. people

(     )38. A. loving             B. taking           C. making       D. thinking

(     )39. A. have            B. get               C. do              D. offer

(     )40. A. everyday         B. every day     C. each day     D. some day

(     )41. A. widely            B. wide            C. great             D. deeply

(     )42. A. either              B. all                C. both                  D. every

(     )43. A. producing          B. ordering       C. making       D. building

(     )44. A. take                B. look at          C. draw             D. put

(     )45.A. one day           B. a day            C. any day      D. the other day

(     )46.A. when                  B. that              C. how                  D. while

(     )47.A. chose                  B. get               C. take            D. make

(     )48.A. a                     B. an                C. the                   D. /

(     )49.A. often            B. never           C. always           D. sometimes

(     )50.A. with             B. under           C. by              D. for   

Sales of laptop computers passed desktops in the U.S. for the first time ever this fall, according to market-research firm IDC. That's bad news for backs, necks and shoulders.

Laptops are bad for our body. When you work at a computer, the keyboard should be at elbow height and the monitor should be roughly at eye level, so you can sit well in a chair. But most users simply set their laptops on a desk or table. The keyboard is too high, which makes your arms reach up, your shoulders feel tired and your wrists bend down. The monitor is too low, which pulls your head and neck forward and down and your back may feel hurt.

That's OK if you use your laptop for a short time. But if you use one for hours without stopping – as do millions of college students, business travelers, telecommuters, video-gamers and growing numbers of office workers – your body may feel hurt. Ergonomics experts have warned about laptop problems for years. But people still like laptops better than the desktops. And they use laptops anywhere – in bed, on the floor – in all kinds of positions.

“How can a mouse or a keyboard hurt you?” says Thomas Caffrey, the founder of Myofactors LLC, “Wrong positions can be bad for your body. As time goes by, a wrong position can lead to pain in the neck, shoulders, back and arms, as well as headaches.”

1.When you work at a computer, the keyboard should be ________.

2.The writer asks us not to use the laptop ________.

3.From the passage, we know that laptop computers ________.

4.Using a laptop in a wrong position may make ________.

5.According to the passage, which of the following is NOT true?