例題2 　　1、先看文章后面的問題，找出每一句題干中的關(guān)鍵詞，特別關(guān)注時間、地點、專有名詞、關(guān)鍵動詞以及表示上下文邏輯關(guān)系的單詞或者短語。 　　2、回到原文，閱讀原文，按照題目順序作答。 　　3、觀察文章題目和每一段的第一句話，找出本段的主題句。 　　4、在閱讀文章時，看到題干中的關(guān)鍵詞或者同題干關(guān)鍵詞相同或相近的單詞或短語時，要特別留意。 　　5、注意區(qū)分“錯誤(wrong)”和“沒有提到(not mentioned)”。 　　Computer Mouse 　　The basic computer mouse is an amazingly clever invention with a relatively simple design that allows us to point at things on the computer 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 computer mouse daily without stopping to think how it works (第一題：大多數(shù)大多數(shù)計算機用戶天天使用計算機，卻沒有想到要了解以下鼠標(biāo)的工作原理。選擇“B錯誤”)until it gets dirty and we have to learn how to clean it. We learn to point at things before we learn to speak, so the mouse is a very natural pointing device. Other computer pointing devices include light pens, graphics tablets and touch screens, but the mouse is still our workhorse. 　　The computer mouse was invented in 1964 by Douglas Englehart of Stanford University. As computer screens became more popular and arrow keys were used to move 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 computer in 1983, really started the computer public on the road to relying on the mouse for routine computer tasks. 　　How does the mouse work? We have to start at the bottom, so think upside down 　　now. It all starts with the mouse ball(一切都始于鼠標(biāo)球). As the mouse ball in the bottom of the mouse rolls over the mouse pad(當(dāng)鼠標(biāo)底部的鼠標(biāo)球在鼠標(biāo)墊上滾動的時候), it presses(壓迫) against and turns two shafts(它壓迫到兩個滾軸并使其轉(zhuǎn)動). The shafts are connected to wheels with several small holes in them(這兩個滾軸上有一些小孔：“them”指的是“shafts”，并與滾軸相連). The wheels have a pair of small electronic light-emitting devices called light-emitting diodes (LED) mounted (fixed安裝;固定) on either side. (滾輪兩邊各有一個叫做“二極管”的小型電子發(fā)光器件。)One LED sends a light beam to the LED on the other side.(其中一個發(fā)光的二極管向另外一個二極管發(fā)出光束。)(第四題：鼠標(biāo)的部件有滾動部件，如滾球，也有觀點裝置，如二極管等。二極管將光信號轉(zhuǎn)換為電信號，傳送到計算機，計算機根據(jù)收到的電信號作出相應(yīng)的反應(yīng)，因此二極管是鼠標(biāo)的主要部件，而滾輪等只是輔助性的機械部件。) As the wheels spin and a hole rotates by, the light beam gets through the LED on the other side. (當(dāng)滾輪轉(zhuǎn)過一個小孔時，光束通過小孔到達另一邊的發(fā)光“二極管”。)But a moment later the light beam is blocked until the next hole is in place.(但是稍后，該光速被阻礙，知道下一個孔轉(zhuǎn)到這個位置時才能繼續(xù)通過，并到達另一邊的發(fā)光“二極管”。) The LED detects a changing pattern of light(發(fā)光二極管檢測出光束的變化模式), converts the pattern into an electronic signal(將該模式轉(zhuǎn)換成電子信號，并通過一條伸出鼠標(biāo)的電纜將信號傳輸給計算機。), and sends the signal to the computer through wires in a cable that goes out of the mouse body. This cable is the tail that helps give the mouse its name.(第三句：鼠標(biāo)的名稱源自鼠標(biāo)主體拖出的一根看上去像老鼠尾巴一樣的電線) The computer interprets the signal to tell it where to position the cursor(光標(biāo)) on the computer screen. (計算機通過解讀信號確定光標(biāo)在計算機屏幕上的位置。) 　　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 dirt. Eventually you have to clean the mouse. (第五題：鼠標(biāo)臟了，可以擦干凈再用，并不需要更換。)The newer optical mice avoid this problem by having no moving parts. (第七題：新的光電鼠標(biāo)因為沒有滾動的部件，于是就避免了這一問題。光電鼠標(biāo)因為沒有普通鼠標(biāo)使用的滾動部件，所以不會吸附灰塵，用不著擦拭，這是一種新型的鼠標(biāo)。)