1.In terms of physics, the characteristic feature of the roller coaster is that the cars’ potential energy, gained through their being lifted by a chain drive through the Earth’s gravity to the top of the first drop, has been converted to kinetic energy by the time the ride ends.
(A) cars’ potential energy, gained through their being lifted by a chain drive
(B) cars’ potential energy, a gain achieved as they are lifted by a chain drive
(C) potential energy from the cars’ being lifted by a chain drive
(D) potential energy of the cars, gained as a chain drive lifts them（D）
(E) potential energy gained by the cars, being achieved while a chain drive lifts them
我觉得这里是有对应的 A has benn converted to B A：potential energy of the cars 对应B： kinetic energy A : gained as a chain drive lifts them 对应 B ：by the time the ride ends(as 对应 by the time ,as 在这里表示一个时间的概念)
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发表于 2006-11-15 07:22:00
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