{{B}}Computers in Cars{{/B}}
You're far from home on a lonely road. Shadowy forests stretch away on
both sides. A thick mist (雾) makes it difficult to see far beyond your car's
windshield (挡风玻璃). "Can this be route 90A?" you wonder. If it
is, you should be near a town. Yet there's no hint of one. Night is closing in,
and you're low on gasoline. This is a situation where an in-car
computer that can navigate would be a big help. A car computer
that navigates? Yes! Such computers exists. Several experimental models are
being tested by General Motors, Ford, Chrysler, and several foreign car markets.
These computers vary in details. But they all contain series of maps on
Vediodiscs or videotapes. For example, one computer system contains 13,300 maps
covering the continental US. Before starting out on a trip, a
driver can type in the code for the region he or she plans to drive through. The
computer then shows a map of that region. At the same time, a tiny radio
receiver linked to the computer goes to work. It picks up signals from
navigation satellites such as the NAVSTAR network. Using these signals, the
computer shows a the car's position at all times and displays this position on
the map. The computer can also calculate and display the best route to
follow. A navigation computer may also receive and use data
about road construction, weather conditions, and traffic jams. This information
would be displayed to the driver and the computer would also use the information
to work out alternate (交替的) routes. Most cars nowadays also
contain computers that help cars run more effic!ently. Microprocessors (微处理机的)
control certain engine functions by regulating the mixing of fuel. Data on car
speed, oil pressure, revolutions per minute, engine temperature, and fuel level'
can be displayed as digital data (numbers) or warming lights.
Some auto designers suggest that a central computer display can be used to
clearly present such timely information as car speed and fuel level. Warning
lights would indicate a drop in oil pressure or a sudden rise in engine
temperature. To get more information on these conditions, the driver would call
it up on the computer display screen. When needed, the computer could be "asked"
to provide navigation aid or information about the car's
condition.
单选题
By describing a typical situation of a lost driver on the road, the author intend to ______.
【正确答案】
C
【答案解析】[解析] 借助题干十的核心结构(alostdriver。ntheroad)作为答案线索，这样发现答案相关句：“Can this be route 90A?'’you wonder．If it is，you should be near a town．Yet there's no hint of one． (该划线句的内容表明“你”在公路上驾车迷路了)Night is closing in, and you're low on gasoline．This is a situation where an in-car computer that can navigate would be a big help．描述了具体细节信息后往往会出现总结/概括性的话语，上面这个划线句的出现就符合这个逻辑安排特点。划线句说在这样的情况下(司机迷路)车载导航系统能起很大的帮助，这与D的含义一致。
单选题
The word "navigate" in Paragraph 3 means ______.
单选题
The navigation computers have one thing in common: they all ______.
【正确答案】
A
【答案解析】[解析] 借助常识判断C，D不可能是答案。利用“navigation computers”作为答案线索，注意题干中的修饰词"ail"，这样在文章中找到答案相关句：These computers vary in details．But they all contains genes of maps on Vediodiscs or videotapes．For example，one computer system contains 13,300 maps covenng the continental US．
单选题
Without signals from navigation satellites, the in-car computer ______.
【正确答案】
B
【答案解析】[解析] A和B是正反义项，重点注意。利用“navigation satellites”作为答案线索，这样在文章中找到答案相关句：Before starting out on a trip，a driver Can type in the code for the region he or she plans to drive through．The computer then shows a map of that region．At the same time，a tiny radio receiver linked to the computer goes to work．It picks up signals from navigation satellites such as the NAVSTAR network．Using these signals，the computer shows a thecar's position at all times and displays this position on the map．划线句说“使用这些(来自导航卫星)的信号，计算机能一直在地图上显示出汽车的位置”，显然如果没有导航卫星的信号，计算机就无法确认汽车的位置，所以B是答案。
单选题
Of the following functions, which is NOT possessed by the navigation computer?
【正确答案】
B
【答案解析】[解析] 内容违背常识，所以判断B很可能答案。也可以利用原文内容：利用备选项中的核心词作为答案线索，这样在文章中找到答案相关句，判断答案。Before starting out on a trip，a driver can type ln the code for the region he or she plails to drive through．The computer then shows a map of that legion．(与A呼应)At the same time，a tiny radio receiver linked to the computer goes to work．It picks up signals from navigation satellites such as the NAVSTAR network． (与D呼应)The computer can also calcMate and display the best route to follow．A navigation computer may also receive and use data about road construction, weather conditions,and traffic jams.(与C呼应)