So far we have only discussed the basic computer mouse that most of you probably have or have used. One problem with this design is that the mouse gets dirty as the ball rolls over the surface and picks up the dirt. Eventually you have to clean your mouse. The newer optical mice avoid this problem by having no moving parts.

　　1.Most computer users want to know how the computer mouse works.

　　A. right B. wrong C. not mentioned

　　2. According to the author, general computer users need not know how the computer mouse was invented.

　　A. right B. wrong C. not mentioned

　　3. The computer mouse derives its name from the cable that goes out its body, which looks like the tail of a mouse.

　　A. right B. wrong C. not mentioned

　　4. The key components of a computer mouse are the two LEDs.

　　A. right B. wrong C. not mentioned

　　5. When an ordinary computer mouse gets dirty, it has to be replaced with a new one.

　　A. right B. wrong C. not mentioned

　　6. The most durable computer mice on sale are the IBM ones.

　　A. right B. wrong C. not mentioned

　　7. The optical mouse is superior to the basic one in that the former has no moving parts.

　　A. right B. wrong C. not mentioned

　　答案与解析：

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