401. 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 (E) potential energy gained by the cars, being achieved while a chain drive lifts them 答案是D，没有问题，请问如果答案A如果改为“cars' potential energy, gained as a chain drive lifts them" 是不是也对，究竟什么时候应该用's所有格形式，什么时候用of表示所属关系呢？ets是否也有偏好？
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发表于 2004-1-7 16:15:00
