（1）     GWD-27-Q7

Providing initial evidence that airport 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.

1. as much as that which is being emitted annually by all

2. as much annually as is emitted by the

3. as much compared to what is annually emitted by all

4. that emitted annually by all

5. that emitted annually compared to the

答案是D,我选得B,错在什么地方啊?

the total amount....... is twice that(that必须补出)........

B as much annually as is emitted by the

两点错误：

1.amount不好用much，最好用big或者great

2.没有补出amount的代词

看必较的对象是什么, 比较的是the total...emitted ...by... is twice that(the total....) emitted by.. 这里的emmitted 是定语修饰the total amount

Providing initial evidence that airport 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.

我觉得B选项要改成as much as what is usually emitted by the才是可以接受的。

原选项省略了that，其实这里要用what，另外usually的位置也不对，当然这不是优先排除的考点。

谢谢楼上的XDJM,明白了,找到大全的两个例子

大全102例

1.                  American productivity is declining in relation to Europe’s; the energy expended
            per unit of production in the United States is as much as twice that expended in West Germany.

(A) as much as twice that expended in West Germany( that指代the energy)

(B) as much as twice that of West Germany’s expenditure

(C) up to two times of West Germany’s expenditure

(D) up to two times what West Germans expended（A）

(E) up to double the West German expenditure

大全404

2.                  In the 1980’s the rate of increase of the minority population of the United States was nearly twice as fast as
                the 1970’s.

(A) twice as fast as(概念不对称)

(B) twice as fast as it was in(句子和短语不对称)

(C) twice what it was in(what从句相当于名词短语)

(D) two times faster than that of（C）

(E) two times greater than

twice用于数量上的翻倍

可是twice是副词，后面that如果是指代amount的话，一个副词直接跟代词好像也怪怪的

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