prep语法(11)

a floor结构平行;that限定性定语从句修饰floor没有歧意;用to prevent表示目的,简洁,明了.

(E) it没有指代,their指代不清,即可能指代floors也可能指代wagons；不定式表目的，而so that…通常 表达结果。

句子结构: Developed by Pennsylvania’s Palatine…, Conestoga wagons had high wheels capable

of corssing A,B,and C, and a floor that…

补充说明:

一般来说,当一个代词可以指代多个对象时,它优先指代离它较近代的对象,如果就近指代会导致逻辑 意思的错误,则可以肯定该选项犯有指代不清的错误.(目前GMAT题目均符合该规律)

有and出现的时候,一定要警惕是不是会有平行结构的考点.读选项时,重点读and连接的对象,跳过修饰 语等成分,如果and连接对象不平行,则可以直接排除该选项,节省时间

66. (28087-!-item-!-188;#058&003498)

(A) the estimated population

(B) that of their estimated population (C) more than the population's estimated amount

(D) more black rhinos than their population estimate (E) more than that of their population's estimated amount

考点:习惯用语（Idiom） 简洁有效（Rhetorical Construction）

1) 倍数的表达

1)twice as many...as; twice as much...as; twice + the + n.; twice + what 从句

2)用动词表达数 double, triple, quadruple, quintuple, 可用主动语态,也可以用被动语态,但不能和 as 搭配

3)...times(或数字) + as + 形容词或副词 + as...或…times the + n

4) sb. be + 百分数 + more likely to do sth. than (to) do sth

(A) 正确, 表达符合习惯用法,意思表达清晰,简洁

(B) that只能指代rhino population,从而跟后面的their estimated population意思重复

(C) the population’s estimated amount表达笨拙,复杂

(D) 表达复杂,笨拙；their没有指代对象。

(E) 表达复杂,笨拙,that指代rhino population和their population’s estimated amount意思重复；their 没有指代对象。

句子结构: …population…numbered about 20,000, ten times the…

67. (28133-!-item-!-188;#058&003500)

Scientists say that each of the photographs taken of the Ares Vallis plain by the Mars Pathfinder rocks were scattered by its force.

(A) indicate the overwhelming extent to flooding on the planet billions of years ago and the degree that (B) indicate that the extent of the floods on the planet billions of years ago was overwhelming and

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