2. 外语
  3. Once it was considered good to keep the car engine idle a minute or two following cold stars. Today, with modern technology, the

Once it was considered good to keep the car engine idle a minute or two following cold stars. Today, with modern technology, the

admin2011-02-04  43
问题     Once it was considered good to keep the car engine idle a minute or two following cold stars. Today, with modern technology, the opposite is true. An engine operating under road conditions will warm up faster and run more efficiently than one that is idling. Idling just burns gas (on average, about a gallon an hour).
    When you have a full tank of gas, park the ear facing downhill is possible, this will prevent any gas from coming out of the tank. Parking in areas of less or no sunlight helps prevent the gas from steaming that would occur if you parked in the hot sun. Your car will stay cooler, too, and that means less gas consuming work for the air conditioner once the engine is started.
    Stay away from wide-track tires if you want top mileage (耗油1升行强多的英里里程). Narrow-track tires produce less friction and thus rolling resistance. The same effect is achieved by adding three to five pounds above recommended pressure to each tire; while this won’t noticeably affect your ear’s sliding quality, it will increase tire life and gas mileage.
    Check tire pressure often, especially when the weather turns cold. The difference between winter and summer tire pressure can be as much as eight pounds. This could cost you two miles per gallon.  
The main purpose of the passage is ______.
选项 A、to tell us how expert drivers try to save gas
B、to tell us how to drive a car properly
C、to tell us how to make a car run smoothly
D、to tell us how to make your car consume less gas
答案D
解析 本题考查文章的主旨。主旨题出现在第一题，答案一般会在第一段。从第一段第三、四句An engine operaring under road conditions will warm up faster and run more efficiently than one that is idling。Idling just burns gas．(在路面状况下，汽车处于行驶中，发动机会热的更快，运转的更有效。 让发动机空转只会费油。)可以得知作者是告诉我们省油的办法，因此答案选D。
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