點擊查看：2018年6月大學英語六級閱讀100篇

　　Navigation computers, now sold by most car-makers, cost $2,000 and up. No surprise, then, that they are most often found in luxury cars, like Lexus,BMW and Audi. But it is a developing technology-meaning prices should eventually drop-and the market does seem to be growing.

　　Even at current prices, a navigation computer is impressive. It can guide you from point to point in most major cities with precise turn-by-turn directions-spoken by a clear human-sounding voice. and written on ascreen in front of the driver.

　　The computer works with an antenna (天線) that takes signals from no fewer than three or the 24, global positioning system (GPS) satellites. By measuring the time required for a signal to travel between the satellites and the antenna. the car's location can be pinned down within l00 meters.

　　The satellite signals. along with inputs on speed from a wheel-speed sensor and direction from a meter, determine the car’s position even as it moves. This information is combined with a map database. Streets, landmarks and points of interest are included.

　　Most systems are basically identical. The differences come in hardware-the way the computer accepts the driver's request for directions and the way it presents the driving instructions. On most systems, a driver enters a desired address, motorway junction or point of interest via a touch screen or disc. But the Lexusscreen goes a step further: you can point to any spot on the map screen and get directions to it.

　　BMW's system offers a set of cross hairs(瞄準器上的的十字紋)that can be moved across the map (you have several choices of map scale) to pick a point you'd like to get to. Audi's screen can be switched to TV reception.

　　Even the voices that recite the directions can differ, with better systems like BMW's and Lexus's having awider vocabulary. The instructions are available in French. German, Spanish, Dutch and Italian, as well asEnglish. The driver can also choose parameters for determining the route: fastest, shortest or no freeways(高速公路), for example.

　　1. We learn from the passage. that navigation computers______________.

　　A) will greatly promote sales of automobiles

　　B) may help solve potential traffic problems

　　C) are likely to be accepted by more drivers

　　D) will soon be viewed as a symbol of luxury

　　2. With a navigation computer, a driver will easily find the best route to his destination________.

　　A) by inputting the exact address

　　B) by indicating the location of bis car

　　C) by checking his computer database

　　D) by giving vocal orders to the computer

　　3. Despite their varied designs, navigation computers used in cars___________________.

　　A) are more or leas the same price

　　B) provide directions in much the same way

　　C) work on more or less the same principles

　　D) receive instructions from the same satellites

　　4. The navigation computer functions__________________.

　　A) by means of a direction finder and a speed detector

　　B) basically on satellite signals and a map database

　　C) mainly through the reception of turn-by-tum directions

　　D) by using a screen to display satellite signals

　　5. The navigation systems in cars like Lexus. BMW and Audi are mentioned to show__________.

　　A) the immaturity of the new technology

　　B) the superiority of the global positioning system

　　C) the cause of price fluctuations in car equipment

　　D) the different ways of providing guidance to the driver

　　答案：

　　1.從文章中我們得知，導航電腦__________________。

　　A)會大大提高汽車的銷售

　　B)可以幫助解決潛在的交通問題

　　C)很可能會被更多的司機所接愛

　　D)很快會被視作奢侈品的象征

　　[C]根據文章第1段“這是一項正在發展的技術，而且其市場還有很大的潛力”，可推斷，它將被越來越多的駕駛員接受。故選C。

　　2.有了導航電腦，司機就能很容易找到去目的地的最佳路線，方法是___________________。

　　A)輸入準確的地址

　　B)顯示汽車的位置

　　C)檢查電腦的數據庫

　　D)對電腦發出口頭指令

　　[A]根據文章第5段“在大多數電腦系統中，駕駛員只需觸模屏幕輸入要去的地方即可”，由此可推斷，輸入確切的目的地就是駕駛員唯一要做的事。因此，A正確。

　　3.雖然設計各不相同，車用導航電腦____________________。

　　A)價錢都差不多

　　B)指路的方式都-樣

　　C)原理基本一樣

　　D)從同樣的衛星接收指令

　　[C]根據文章第5段“大多數電腦系統的工作原理基本上是一致的，區別只是在于硬件——電腦接受駕駛員指令的方式和電腦輸出駕駛指令的方式不同”，因此，C正確。

　　4.導航電腦起作用，____________________。

　　A)是通過一個方向尋找器和一個速度檢測器實現的

　　B)基本上是依賴衛星信號和一個地圖數據庫

　　C)主要是通過接收逐步方向指令

　　D)使用一個屏幕來顯示衛星信號

　　[B]根據文章第4段“衛星信號，連同車速傳感器提供的車速數據和定向儀提供的方向一起確定汽車前進時的位置。這些信息同一個地圖數據庫相結合”，故B正確。

　　5.文章提到凌志，BMW和奧迪的車用導航系統，是為了顯示_____________________。

　　A)新技術的不成熟性

　　B)全球定位系統的優越性

　　C)汽車設備價錢波動的原因

　　D)為駕駛員指路的不同方式

　　[D]根據文章第5段提出的觀點(見第3題)，在以下的幾段中，圍繞此觀點，文章具體舉例說明了安裝了導航電腦的這幾種車型在這兩方面到底有什么不同，也就是說在給駕駛員提供指令方面到底有什么不同。由此可推斷D正確。

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