GMAT考题：Prep2008E1-SC-202

GMAT考题

题库 / Prep2008E1-SC-202

Providing initial evidence that airports are a larger source of pollution than they were once believed to be, environmentalists in Chicago report that the total amount of pollutant emitted annually by vehicles at O'Hare International Airport is twice as much as that which is being emitted annually by all motor vehicles in the Chicago metropolitan area.

as much as that which is being emitted annually by all

as much annually as is emitted by the

as much compared to what is annually emitted by all

that emitted annually by all

that emitted annually compared to the

考题讲解

毕出

题目分析：
略。

选项分析：

A选项：is being emitted时态有误。本题的比较对象是“在机场的车辆释放的污染物量”和“市区所有机动车释放的污染物量”，因此，不能说是“在机场的车辆释放的污染物量”和“市区所有机动车正在释放的污染物量”（这样后者肯定少了，因为只是某一时刻的量）。

B选项：副词annually应修饰动词emit，即，每年地释放，而不能修饰much。

C选项：语法有误，as much as是正确的搭配，不能用as much compared to。

D选项：Correct. 本选项在语法和逻辑上均是正确的。twice后面可以直接接名词，也可以加as much as。

E选项：过去分词短语compared to应改为介词by。这是因为，后一个比较对象应是“市区所有机动车释放的污染物量”，即，motor vehicles in the Chicago metropolitan area是emit的逻辑发出者。被动语态规定，be done by A中的A才是do的逻辑主语。