單項選擇題
Computers in Cars
You're far from home on alonely road. Shadowy forests stretch away on both sides. athickmist (霧) makes it difficult to see far beyond your car's windshield (擋風玻璃).
"Can this B.e route 90A?" you wonder. If it is, you should be near atown. Yet there's nohint of one. Night is closing in. And you're low on gasoline.
This is asituation where an in-car computer that can navigate would be abig help.
A car computer that navigates? Yes! Such computers exist. Several experimental models arebeing tested by General Motors, Ford, Chrysler, and several foreign car makers. These computersvary in detail. but they all contain series of maps on videodiscs or videotapes. For example, onecomputer system contains 13,300 maps covering the continental US.
before starting out on atrip, er can type in the code for the region he or she plans todrive through. The computer then shows amap of that region. At the same time, atiny radio re-ceiver linked to the computer goes to work. It picks up signals from navigation satellites such asthe NAVSTAR network. Using these signals, the computer shows the car's position at all timesand displays this position on the map. The computer can also calculate and display the best routeto follow.
Anavigation computer may also receive and use dataabout road construction, weather condi-tions, and trafficjams. This information would be displayed to the driver and the computer wouldalso use the information to work out alternate (交替的' ) routes.
Most cars nowadays also contain computers that help cars run more efficiently. Microproces-sors (微處理的) control certain engine functions B.y regulating the mixing of fuel. Dataon carspeed, oil pressure, revolutions per minute, engine temperature, and fuel level can be displayedas digital data(numbers) or warning lights.
Some auto designers suggest that acentral computer display be used to clearly present suchtimely information as car speed and fuel level. Warning lights would indicate adrop in oil pres-sure or asudden rise in engine temperature. To get more information on these conditions, thedriver could 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.
by describing atypical situation of alost driver on the road, the author intends to__________.
us believe how complex the highway computer network is
us know how in-car computers are linked to road signs
us how helpful anavigation computer can be
us that NAVSTAR has come into use
2、 Who is the head of this delegation?
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3、 The Moon and most artificial satellites travel around the Earth in elliptical paths.
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4、They only have a limited amount of time to get their points across.
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5、 根據以下材料回答題：
Genocide
Many people feel that human beings are responsible for the disappearance of some other animal species. While we may have hastened the disappearance of some, abundant evidence suggests mankind has had little impact. Biologists point out that 50 species can be expected to disappear in the twentieth century but also remind us that about 50 species can be expected in the nineteenth century, and 50 species in each of the centuries before that. Dr. T. H. Jukes at the University of California has pointed out that about 100 million animal species have become extinct since life began on Earth about 3 billion years ago. Thus, animals come and animals go as a natural consequence of something Mr. Darwin discovered. The human race is a recent newcomer to the scene, so we've had nothing whatsoever to do with the disappearance of millions of species.
In fact, when it comes right down to it, we're a miserable failure at genocide (種族滅絕). In spite of an all-out centuries-old war on rats, we haven't made a dent in their numbers, much less extinguished a single species. And in spite of all our high technology we haven't been successful in eliminating a single undesirable insect species!
A friend of mine owns most of the Douglas DC-7 aircrafts left in the world. They make excellent spray planes because they can carry a lot of insecticide and fly for a very long time over great distances. Last year, his company sprayed most of the western Sahara and the Sahel regions of Africa to hold down the locusts and grasshoppers. This year, the environmentalists put pressure on the U.N. to stop it because dieldrin and malathion might cause an increase in the cancer risk of people in the western Sahara and the Sahel. As a result, the hoppers and locusts are back by the zillions and the crops are failing. But the people of West Africa certainly aren't going to worry about dying of cancer; they are dying of starvation instead.
