5. When an ordinary(普通的) #puter mouse(鼠标) gets dirty(脏的), it has to be replaced (不得不被替换)with a new one.

　　A. right B. wrong C. not mentioned

　　5.B. 细节题。利用问题句中的含有修饰词的细节信息结构new one(new mouse)及另一个修饰词dirty 共同作为答案线索作为答案线索，在文章中查找答案相关句：

　　The basic #puter mouse is an amazingly clever invention with a relatively simple design that allows us to point at things on the #puter and it is very productive. Think of all the things you can do with a mouse like selecting text for copying and pasting, drawing, and even scrolling on the page with the newer mice with the wheel. Most of us use the #puter mouse daily without stopping to think how it works until it gets dirty and we have to learn how to clean it. We learn to point at thing before we learn to speak, so the mouse is a very natural pointing device. Other #puter pointing devices include light pens, graphics tablets and touch screen, but the mouse still our workhorse.

　　The #puter mouse was invented in 1964 by Douglas Englehart of Stanford University. As #puter screens became popular and arrow keys were used to more around a body of text, it became clear that a pointing device that allowed easier motion through the text and even selection of text would be very useful. The introduction of the mouse, with the Apple Lisa #puter in 1983, really started the #puter public on the road to relying on the mouse for routine #puter tasks.

　　How does the mouse work? We have to start at the bottom, so think upside down for now. It all starts with mouse ball. As the mouse ball in the bottom of the mouse rolls over the mouse pad, it presses against and turns two shafts. The shafts are connected to wheels with several small holes in them. The wheels have a pair of small electronic light-emitting devices called light emitting diodes (LED) mounted on either side. One LED sends a light beam to the LED on the other side. As the wheels spin and a hole rotates by, the light beam gets through to the LED on the other side. But a moment later the light beam is blocked until the next hole is in place. The LED detects a changing pattern of light, converts the pattern into an electronic signal, and sends the signal to the #puter through wires in a cable that goes out the mouse body. This cable is the tail that helps give the mouse its name. The #puter interprets the signal to tell it where to position the cursor on the #puter screen.

　　So far we have only discussed the basic #puter mouse that most of you probably have or have used. One problem with this design(设计) is that the mouse gets dirty as the ball rolls over(在...上面滚过) the surface (表面)and picks up(捡起, 获得, 加快) the dirt(灰尘). Eventually(最终) you have to clean(把...弄干净) your mouse. The newer optical mice avoid this problem by having no moving parts.

　　从答案相关句中可以看出鼠标脏了可以察干净再用， 因此问题句提供了错误的信息。

　　考点：上下文之间的意义关系― 条件与结果。

　　6. The most durable(持久的， 耐用的) #puter mice(鼠标) on sale (在销售的)are the IBM ones.

　　A. right B. wrong C. not mentioned

　　6.C. 细节题。利用问题句中的含有修饰词的特征词IBM及涉及到形容词最高级结构的细节信息结构The most durable #puter mice共同作为答案线索作为答案线索， 在文章中查找答案相关句， 结果发现这个两个结构在文章中均没有呼应的内容，因此判断该问题句的内容在文章中没有被提到。

　　提示：

　　如果问题句中出现了以比较级形式或最高级形式出现的形容词或副词结构， 则往往可以利用这样的结构作为答案线索在文章中查找与问题句相关的内容。

　　7. The optical(光学的) mouse(鼠标) is superior to (优于...)the basic(基本的, 普通的) one in that (因为)the former (前者)has no moving parts(运动部件).

　　A. right B. wrong C. not mentioned

　　7.A. 细节题。利用问题句中细节信息词optical mouse, basic one (basic mouse), moving parts共同作为答案线索作为答案线索，在文章中查找答案相关句：

　　The basic #puter mouse is an amazingly clever invention with a relatively simple design that allows us to point at things on the #puter and it is very productive. Think of all the things you can do with a mouse like selecting text for copying and pasting, drawing, and even scrolling on the page with the newer mice with the wheel. Most of us use the #puter mouse daily without stopping to think how it works until it gets dirty and we have to learn how to clean it. We learn to point at thing before we learn to speak, so the mouse is a very natural pointing device. Other #puter pointing devices include light pens, graphics tablets and touch screen, but the mouse still our workhorse.

　　The #puter mouse was invented in 1964 by Douglas Englehart of Stanford University. As #puter screens became popular and arrow keys were used to more around a body of text, it became clear that a pointing device that allowed easier motion through the text and even selection of text would be very useful. The introduction of the mouse, with the Apple Lisa #puter in 1983, really started the #puter public on the road to relying on the mouse for routine #puter tasks.

　　How does the mouse work? We have to start at the bottom, so think upside down for now. It all starts with mouse ball. As the mouse ball in the bottom of the mouse rolls over the mouse pad, it presses against and turns two shafts. The shafts are connected to wheels with several small holes in them. The wheels have a pair of small electronic light-emitting devices called light emitting diodes (LED) mounted on either side. One LED sends a light beam to the LED on the other side. As the wheels spin and a hole rotates by, the light beam gets through to the LED on the other side. But a moment later the light beam is blocked until the next hole is in place. The LED detects a changing pattern of light, converts the pattern into an electronic signal, and sends the signal to the #puter through wires in a cable that goes out the mouse body. This cable is the tail that helps give the mouse its name. The #puter interprets the signal to tell it where to position the cursor on the #puter screen.

　　So far (到目前为止) we have only discussed(讨论) the basic(普通的) #puter mouse that most of you probably(可能) have or have used. One problem with (关于...的问题)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(避免) this problem by having no moving parts(运动部件).

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