求助，关于double和twice的用法！

mayarie

According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey.
(A) doubling those reported in the 1977 survey
(B) to double the number the 1977 survey reported
(C) twice those the 1977 survey reported
(D) twice as much as those reported in the 1977 survey
(E) twice the number reported in the 1977 survey
选E
有点不太明白为什么不选A呢？A里those指代的是什么？doubling修饰的应该是人还是数字？percent？
twice the number reported in the 1977 survey又做什么成分呢，同位语？状语？

以及下面这题
The number of people flying first class on domestic flights rose sharply in 1990, doubling the increase of the previous year.  
A.        doubling the increase of
B.        doubling that of the increase in
C.        double as much as the increase of
D.        twice as many as the increase in   
E.        twice as many as the increase of
选A
想问一下E项，如果把many改成much，语法笔记里面解释twice as much as是同位语修饰词，要紧挨修饰的名词(figure)，再看第一题，晕了….

求助！谢谢！

小草莓之梦

谢谢NN的解释，豁然开朗

zhudanqing

LZ联系去看OG125题
根据baby姐的总结如下："double的用法体会：
..., doubling the amount of X
..., doubling the rate of X
""double""后面往往跟这一类的词：amount, quantity, speed, frequency, rate (of), rates (for), price, ...有规律吧？肯定不能跟""apples""""students""这一类的具体的东东。（OG12 #14有double的正确用法）
归纳一下, “a doublingof” 后面跟什么样的词？
数量(number,amount, quantity…)，价值，一些物理量(如concentration, pressure, force…)
之所以有人归纳说“GMAT里面 a doubling of 永远错”，是因为GMAT经常会错误地在 “a doubling of” 后面跟具体名词诸如apples, students——这用法就是错的。
"

"as many as/ twice/as much as引申的知识点：
twice as many+可数名词
twice as much+不可数名词
twice\double+ the+an explicitly numerical quantity
e.g., twice the increase\force --> ""increase"" is an explicitly numerical quantity
eg: twice the water... --> incorrect, since water is not a numerical quantity
twice as much as the increase... --> incorrect; redundant
twice the increase... --> correct"

我想看完这段话你应该明白了吧~~

shawnshao

第一题第二题 你看到前面的逗号了  逗号后面引领的是一个状语 就相当于程度副词 并没有parellel的要求  要做到的是状语里的逻辑主语和主句的主语一致

所以考点不一样

shawnshao

sunshiyao93 发表于 2013-9-21 14:42
按照您的回答，可不可以这么理解，twice或者double后面如果直接加名词，这个词要是一个描述数字的词？有 ...

新发的这个题目是一个twice引领的比较  就是比较的双方要对等  主句中的主语是名词  twice后面也加名词

sunshiyao93

shawnshao 发表于 2013-9-20 22:51
两个题目一起看应该很清楚了

第一个是young adults做subject 所以不能用doubling 数字才能doubling

按照您的回答，可不可以这么理解，twice或者double后面如果直接加名词，这个词要是一个描述数字的词？有一题想请教一下，GWD-27-Q7，也是prep08上的：
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 pullutant emitted annually by vehicles at O'Hare International Airport is twice that emitted annually by all motor vehicles in the Chicago metropolitan area.
题后的解释说twice后可以直接加名词，这与楼主帖子里的两题解释矛盾吗？还是说本题中的that所指的就是前面的amount，因为是数所以才能直接用twice？

shawnshao

两个题目一起看应该很清楚了

第一个是young adults做subject 所以不能用doubling 数字才能doubling
这样第一题就只有CDE  twice后面应该是加个数字  或者as .. as结构  C后面加的人  不行 D 中应该用MANY
第二个题就只有ACB  B不该有that 就算把number带进去也不通  C中double要用ING

sunshiyao93

还有，第一题里面的第四个选项，如果改成twice as many as reported in the 1977 survey行吗？

sunshiyao93

同问！！！