GMAT语法比较结构是语法考试四大类考点之一，它包含丰富的内容，常见标志词有Like, Unlike, More than, Less than, Faster than, different from, in contrast with/to, Compare to, as, as (adj.) as, as much as, as fast as, the same as…今天我们就来讲解几道prep-07-1部分的GMAT语法比较题练习(三)。
例：
63. (27901-!-item-!-188;#058&003440)
Unlike emergency calls that travel through regular telephone lines, where they thus automatically inform the operator of the location and phone number of the caller, cellular calls require emergency operators to determine the location of the caller.
(A) lines, where they thus automatically inform the operator of the location and phone number of the caller, cellular calls require emergency operators to determine the location of the caller
(B) lines and thus automatically inform the operator of the location and phone number of the caller,cellular calls require emergency operators to determine the location of the caller
(C) lines, thus automatically informing the operator of the location and phone number of the caller,the location of the caller on a cellular phone has to be determined by the operator
(D) lines, and thus automatically inform the operator of the location and phone number of the caller,emergency operators have to determine the location of the cellular phone caller
(E) lines, thus automatically informing the operator of the location and phone number of the caller,emergency operators receiving a cellular call have to determine the location of the caller
答案解析：
(A) 关系代词where修饰lines,逻辑错误.
(B) 正确, and前后平行,travel… and thus automatically inform共同修饰calls
(C) 比较双方不对等,emergency calls和the location of the caller没有可比性; thus automatically informing表达错误,这里不应该用伴随结构,而应该用and thus来连接两个存在因果关系的句子
(D) and前面有逗号,说明and后面应该是一个完整的句子,应该补出主语they,但这样会使得句子变得复杂,直接去掉逗号构成动词的并列更好;比较双方不对等,emergency calls和emergency operators没有可比性
(E) 比较双方不对等;句子不完整,整个句子的结构为:Unlike emergency calls…, emergency operators receiving…整个句子没有谓语动词; thus automatically informing表达错误,这里不应该用伴随结构,而应该用and thus来连接两个存在因果关系的句子。
例：
Scientists have found signs that moving water changed the chemical makeup of the surface of Mars in recent eras, therefore concluding that its crust is harboring up to three times as much water than was previously thought.
(A) eras, therefore concluding that its crust is harboring up to three times as much water than was
(B) eras, therefore concluding that the planet's crust harbors up to three times as much water or more as was
(C) eras and have therefore concluded that the planet's crust harbors up to three times as much water as
(D) eras and they have concluded, therefore, that its crust harbors up to three times as much water,or more, than
(E) eras and concluded, therefore, that the planet's crust is harboring up to three times more water as was
答案分析：
(A) 从逻辑上看conclude这个动作应该和found这个动作构成因果关系的,平等的两个动作,而不应该构成主要和次要成分,因此therefore concluding应该改为and therefore have concluded结构跟主句中的have found构成平等的成分; its指代不清,上一个分句中存在多个单数名词moving water, surface;as …than结构不符合习惯用法
(B) 错误同A; as much water or more as表达不正确
(C) 正确，Scientists have found…and have therefore concluded结构平行; planet’s crust消除了its的指代模糊; three times as much as符合习惯用法
(D) its指代不清; as much water, or more, than表达不正确; they重复,应该去掉
(E) 没有时间证据,concluded应该改为现在完成时,跟前一个并列成分使用同一个时态; three times more water as表达不正确
》》点击了解GMAT语法比较题练习（二）
以上就是关于GMAT语法比较题练习第三部分的内容讲解，关于比较结构的考题形式有很多，后面小编会为大家继续介绍，希望大家能够继续关注GMAT考试备考资讯。
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