gwd27-7 小疑问

morningjay

7. GWD27-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.

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

B.       as much annually as is emitted by the

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

D.      that emitted annually by all

E.       that emitted annually compared to the

这里的D是下面的哪种用法呢，是twice + n.短语 的用法吗，that指代前面的the total amount of pollutant 吗。NN帮忙

1. 倍数比较
2. twice as many/much as

• twice the + n.(twice the average income)
• twice + what从句
• twice + n.短语
• double：vt. + n. / vi. sth. is doubled

morningjay

还想问下E错在哪？

morningjay

OH，知道了。。。compare to把污染和汽车比较了-0-

msuzengli

这里应该是twice the n.用法.

that指代了the total amount of pollution.

用twice as much as的话, 如果改成 A emitted twice as much pollution as B did 或者 The amount of pollution emitted by A is twice as much as that emitted by B (X is twice as much as Y)就对了.

不知道大家怎么看?

AlienX

umm...the usage of twice 可以簡化:
- twice+anything functions as a noun
- twice as+adj/adv+as

yzhao26

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