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　　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 (天线) 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(瞄准器上的的十字纹)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.从文章中我们得知，导航电脑__________________。

　　A)会大大提高汽车的销售

　　B)可以帮助解决潜在的交通问题

　　C)很可能会被更多的司机所接爱

　　D)很快会被视作奢侈品的象征

　　[C]根据文章第1段“这是一项正在发展的技术，而且其市场还有很大的潜力”，可推断，它将被越来越多的驾驶员接受。故选C。

　　2.有了导航电脑，司机就能很容易找到去目的地的最佳路线，方法是___________________。

　　A)输入准确的地址

　　B)显示汽车的位置

　　C)检查电脑的数据库

　　D)对电脑发出口头指令

　　[A]根据文章第5段“在大多数电脑系统中，驾驶员只需触模屏幕输入要去的地方即可”，由此可推断，输入确切的目的地就是驾驶员唯一要做的事。因此，A正确。

　　3.虽然设计各不相同，车用导航电脑____________________。

　　A)价钱都差不多

　　B)指路的方式都-样

　　C)原理基本一样

　　D)从同样的卫星接收指令

　　[C]根据文章第5段“大多数电脑系统的工作原理基本上是一致的，区别只是在于硬件——电脑接受驾驶员指令的方式和电脑输出驾驶指令的方式不同”，因此，C正确。

　　4.导航电脑起作用，____________________。

　　A)是通过一个方向寻找器和一个速度检测器实现的

　　B)基本上是依赖卫星信号和一个地图数据库

　　C)主要是通过接收逐步方向指令

　　D)使用一个屏幕来显示卫星信号

　　[B]根据文章第4段“卫星信号，连同车速传感器提供的车速数据和定向仪提供的方向一起确定汽车前进时的位置。这些信息同一个地图数据库相结合”，故B正确。

　　5.文章提到凌志，BMW和奥迪的车用导航系统，是为了显示_____________________。

　　A)新技术的不成熟性

　　B)全球定位系统的优越性

　　C)汽车设备价钱波动的原因

　　D)为驾驶员指路的不同方式

　　[D]根据文章第5段提出的观点(见第3题)，在以下的几段中，围绕此观点，文章具体举例说明了安装了导航电脑的这几种车型在这两方面到底有什么不同，也就是说在给驾驶员提供指令方面到底有什么不同。由此可推断D正确。

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