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  3. As long as Americans love to drive far and fast, electric cars may never be the perfect answer to the country’s green transporta

As long as Americans love to drive far and fast, electric cars may never be the perfect answer to the country’s green transporta

admin2013-10-22  40
问题     As long as Americans love to drive far and fast, electric cars may never be the perfect answer to the country’s green transportation needs.【C1】______the routine runs of electric school buses are another thing altogether.
    Bus maker Trans Tech Bus this year said it would start making an electric school bus in a【C2】______with Smith Electric Vehicles. The eTrans bus is one of a new【C3】______of zero-emission electric and hybrid-electric models that are【C4】______making their way to school districts around the county.
    It is hard to【C5】______the bulky, boxy school bus at the forefront of clean-energy and fuel-saving technology. Most buses【C6】______on diesel fuel, get mileage in the【C7】______digits and have the aerodynamic(流线型的)profile of, well, a school bus.
    But school buses are almost ideally【C8】______to be electric vehicles. For one thing, they【C9】______fairly short distances on their daily runs,【C10】______leaving city limits on the way to and from school. And they follow set,【C11】______routes. That reduces the chances of a bus accidentally running【C12】______of battery power before it finishes its route and【C13】______to the lot.
    What is more, school buses make【C14】______stops. While that is bad for fuel-efficiency on a【C15】______gasoline or diesel vehicle, electric vehicles can【C16】______some of the energy used in applying the brakes to recharge their batteries, extending their【C17】______.
    One big【C18】______: School buses are off the streets sitting in a depot(车站)for much of the day, giving them plenty of time to recharge their batteries. But money【C19】______an obstacle. While electric buses could save budget-conscious school districts on fuel costs【C20】______the long term, the upfront costs are high.
【C15】
选项 A、conventional
B、efficient
C、valuable
D、functional
答案A
解析 形容词辨析题。本段是对现有的汽车和新型的电动汽车在能源上进行对比，conventional意为“传统的，常规的”，所以应该选A)。efficient“有效率的”；valuable“有价值的”；functional“正常运转的”。
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