C.have no energy consumption when stopping
D.have electric power to assist when needed
解析:选D 细节理解题。根据第三段第二句“Hybrid cars have much smaller ... use less petrol.”可知,混合动力车必要时有电力支持,所以消耗较少的能源。
5.In regenerative braking, ________.
A.the conventional brakes are used to slow down the car
B.energy wasted in conventional cars is stored in the battery
C.the battery charges itself when the car is accelerating
D.the petrol engine is usually turned off automatically
解析:选B 细节理解题。根据第三段可知,混合动力车用电动马达减速而不是用传统的刹车,电动马达降低车速时产生的电能会被自动储存在电池里,而传统汽车浪费了刹车时产生的能量,由此可知B项表述正确。
6.From the last paragraph we can learn that hybrid cars ________.
A.will gain more popularity
B.were first available in the USA
C.free their owners from tax
D.are free to park anywhere in the city
解析:选A 推理判断题。根据最后一段中的“As they use less fuel, hybrid cars ... for free.”可推知,使用混合动力车有很多好处,所以混合动力车会很受欢迎。
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