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单选题
A
Automobile safety.
B
Increasing fuel efficiency.
C
Electricity-powered cars.
D
The improvement of car batteries.
参考答案
参考解析
解析：
[考点]主旨题。录音中介绍了一种新型汽车——电动汽车，介绍了它的优缺点，以及改进缺点的可能的办法，总结起来，主要讲的就是这种电动汽车。C项正确。
[考点]主旨题。录音中介绍了一种新型汽车——电动汽车，介绍了它的优缺点，以及改进缺点的可能的办法，总结起来，主要讲的就是这种电动汽车。C项正确。
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共用题干
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共用题干
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单选题How does foam extinguish an oil fire?（）A
By cooling the oil below the ignition temperatureB
By removing the fuel source from the fireC
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By increasing the weight of the oil
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单选题Increasing the temperature of a fuel will reduce its （）.A
viscosityB
pressureC
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单选题Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in （）A
increased horsepowerB
reduced efficiencyC
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lower cylinder pressures
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单选题A magneto is a technical term forA
an automobile.B
an engine.C
a part of an automobile engine.
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单选题Fuel injected into a diesel engines cylinder is ignited by （）.A
the heat compressed fuel/air mixture in the cylinderB
the fuel igniterC
the fuel injectorD
the fuel pump
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promptedB
persuadedC
imposedD
enlightened
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quantity of fuel to be receivedB
flash point of the fuel as it is receivedC
fuel temperature as it is receivedD
viscosity of the fuel being received
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单选题Faulty operation of diesel engine fuel injection nozzles can be a direct cause of（）.A
excessive fuel nozzle holder coolingB
sediment in the fuel supplyC
distortion of the fuel spray patternD
improper atomization of the fuel
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单选题One significant improvement in the future car will probably be _____.A
its power sourceB
its driving systemC
its monitoring systemD
its seating capacity
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单选题Fuel injection systems meter fuel, atomize fuel, and （）.A
create turbulence in the combustion chamberB
aid in completing cylinder scavengingC
inject fuel at the proper timeD
minimize fuel penetration into the cylinder
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单选题When ship is fouled, increasing the fuel injection for keeping the normal speed will cause the main engine （）A
to work as overload characteristicB
overspeedC
over mechanical load onlyD
over thermal load only
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单选题It is _____ he is determined.A
buying a new car thatB
to buy a new car thatC
to buy a new car whatD
buying a new car which
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单选题The vehicle sales were greatly cut down becauseA
the car manufacturers were concerned about the American economy.B
the market’s performance was found to be the worst in 50 years.C
the prices of fuel rose to a level which was last seen in the 1950s.D
the fuel prices were so high and the economy was facing a depression.
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单选题How does the engine adjust itself to different formulas of fuel?A
By piping in more oxygen for ethanol.B
By sensing the amount of oxygen in a car’s exhaust.C
By burning in a less-than-optimal mode.D
By stopping and checking the fuel tank.
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