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2015年GMAT句子改错练习题及详细解析汇总
42. To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
(A) have to know a great deal more than now about the social and economic
(B) have to know a great deal more than they do now about the social and economical
(C) would have to know a great deal more than they do now about the social and economical
(D) would have to know a great deal more than they do now about the social and economic
(E) would have to know a great deal more than now about the social and economic
答案解析如下:
(A)have to know a great deal more than now about the social and economic
【错误】 比较结构:本选项使用了比较句式,比较句式的本质是两个平行可比的主谓结构在进行比较,只不过其中之一会发生省略。“demographers have to know a great deal more than now”中“than”的后方连接的是一个省略后仅剩下“now”的主谓结构,由于“than”之前也是一般现在时,所以我们只能认为,“than”后方被省略的主谓结构还原后应完全继承前半句“demographers have to know”,即“demographers have to know a great deal more than(they have to know)now”,意思是“人口学家不得不知道(一般现在时)比他们现在不得不知道的更多”,表意明显不合理。相比之下,(E)中的“they do”则是“they know”
省略后的结果,表意为“人口学家将不得不(“would”是虚拟语气,表示实际无法实现)比他们现在知道的更多”。
(B)have to know a great deal more than they do now about the social and economical
【错误】 句子意思:“economical”意思是“节约的”而非“经济上的”。
(C)would have to know a great deal more than they do now about the social and economical
【错误】 句子意思:见(B)。
(D)would have to know a great deal more than they do now about the social and economic
【正确】 “would have to know a great deal more”表明“To develop more accurate population forecasts”当前条件下实际上是不可能的,虚拟语气使用合理。
【大意】 要进行更加准确的人口预测的话,人口学家将不得不比现在还要更多地了解生育的社会经济决定因素。
(E)would have to know a great deal more than now about the social and economic
【错误】 比较结构:类似地,见(A)。
【最优解题思路推荐】
“economic”和“economical”是同根形容词,他们一定不会表达同一个意思,而“economic”是“经济上的”的意思,那么“economical”一定有问题,排除(B)(C)。
当比较句式省略过度时往往会造成语义的不准确、不合理,,这正是(A)和(E)的情况,因此选择(D)。
实验表明:员工在日光下工作时间越多,睡眠时间越长
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