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SAT语法题Becasue earth's gravity is greater than the moon's,the

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SAT语法题
Becasue earth's gravity is greater than the moon's,the energy expended in traveling from the Earth to the Moon is greater than 【the opposite】 direction
(B)that of traveling in the opposite
(E) that ecpended in traveling in the opposite
我选了 B 因为我觉得这个that of应该是指代energy的 所以应该算对吧?但是答案是E 求解释为什么B错了
主要是修饰Enery这个词的一致性要求.简单地说,这里比较的是:
the energy expended in traveling from the Earth to the Moon
vs.
the energy expended in traveling from the Moon to the Earth.
你可以尽量把后者(the energy expended in traveling from the Moon to the Earth),但是不能简化到“断章取义”的程度,你就会发现E才是对的了.