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  3. In term of physics, the characteristic feature of the roller coaster is that the cars’ potential energy, gained through their be

In term of physics, the characteristic feature of the roller coaster is that the cars’ potential energy, gained through their be

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问题 In term 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 gravity to the top of the first drop, had been converted to kinetic energy by the time the ride ends.
选项 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D
解析 首先解释一个物理概念，potential energy指“势能”，kinetic energy指“动能”。在高中物理学过：相对某一固定点来说，某一物体被举起来离此点越高，则势能越大。而当把此物体放下的过程中，其势能就会逐渐转变为动能。本题的句意就是对这一原理的叙述。B中：a gain与achieved虽词性不同，但词意却是一样的，形成同义重复的毛病。C中：potentialenergy之前无限定词，使得此处“势能”缺乏具体性，也不知其与后面的提升汽车有何逻辑联系。E中：gained与being achieved属同义重复；并且while仅强调动作的同时性，即gain与lift是同时发生的。但在此处，句意更强调一个过程，用as(随着)引入时间从句更为恰当(而as不仅可强调两个动作的同时性，还可强调动作的同时性是发生在一个过程中或一个时段内)，因为势能是随着提升的过程而逐渐增加的，D表达了此意，而A中用现在分词的被动语态同样无法表达出这一过程。
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