OG 251

joywzy · 发表于 2003-11-26 10:20:00

The gyrfalcon, an Arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970's. .
A.    extinction; its numbers are now five times greater than
B.    extinction; its numbers are now five times more than
C.    extinction, their numbers now fivefold what they were
D.    extinction, now with fivefold the numbers they had
E.    extinction, now with numbers five times greater than
A, the best choice, uses a singular pronoun, its, to refer to the singular antecedent The gyrfalcon, and it properly uses the construction its numbers are now ... greater than. In B, the construction its numbers are ... more is not idiomatic: there are more birds, but not more numbers. Choices C and D use a plural pronoun, their or they, to refer to a grammatically singular antecedent, The gyrfalcon. Choices D and E wrongly use a phrase introduced by now with to modify The gyrfalcon. In both choices, the phrase confusingly seems to parallel with extinction; a new clause with a present tense verb is needed to state what the gyrfalcon's numbers are now.

OG的解释：Choices D and E wrongly use a phrase introduced by now with to modify The gyrfalcon. 能不能得出对介词短语修饰的一点原则：

1，前面没逗号，修饰的是前面的名词
2，如果前面有逗号，修饰的是主语，如OG251

这点我一直有疑问，请大家帮助。谢谢。

bigcamel · 发表于 2003-11-26 11:10:00

joywzy mm,要注意看choices D and E....后面的话：In both choices, the phrase....是说now with...看上去与with extinction 平行，引起混淆

joywzy · 发表于 2003-11-26 11:17:00

我明了D和E是错的。可是我想问的是根据OG对D和E错误的解释，是不是可以认为介词短语（WITH），如果有逗号，修饰的是主语。

如果没法判断，介词短语（WITH），如果有逗号，修饰的是什么呢？这一点我一直不明白。谢谢。

bigcamel · 发表于 2003-11-26 11:30:00

我没有说清楚。看og解释“choices D and E wrongly use..."的后面的一句话“In both choices, the phrase....“是说now with...看上去与with extinction 平行，引起混淆。
既然ets认为“ ， now with..."可能被（错误地）认为与“with extinction"平行，那么就不能认为介词短语前面有逗号，锈蚀的一定是主语

joywzy · 发表于 2003-11-26 11:48:00

是这样啊，我明白了。谢谢bigcamel
。

2045977 · 发表于 2004-4-5 21:46:00

那选项A里its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970's.是numbers和什么做比较呢？我觉得这里than when用得好像不idiomatic哦，大侠还能帮我解答一下吗？谢谢了！

dxwei2008 · 发表于 2004-4-5 22:51:00

With在逗号后面的用法一般在GMAT语法中是用来跳跃修饰的。一般我们大家都知道，定语从句是不可以进行条约修饰的，但是with短语是没有限制。下面这个例子是with用法的一个说明。
答案没有使用任何定语从句，因为从句要修饰的对象monkey相隔太远，所以使用了with结构。请体会！

1. Visitors to the park have oftenlooked up into the leafy canopy and saw monkeys sleeping on the branches,whose arms and legs hang like socks on a clothesline.

(A) saw monkeys sleeping on the branches,whose arms and legs hang

(B) saw monkeys sleeping on the branches,whose arms and legs were hanging

(C) saw monkeys sleeping on the branches,with arms and legs hanging

(D) seen monkeys sleeping on the branches,with arms and legs hanging（D）

(E) seen monkeys sleeping on the branches,whose arms and legs have hung

D

ios · 发表于 2004-4-5 22:53:00

now 和 when ...比较

mnwo · 发表于 2004-7-13 10:54:00

是不是than 后省略it is

than做准关系代词？

ztlbox · 发表于 2004-7-28 22:19:00

对than后面的比较也有疑问，省略的是they were吗？哪位大侠能讲讲关于比较后面省略的原则，印象中比较后面省略的情况比较少见，多数是成分不全，要求补全的情况。

还有关于numbers, 为什么不是number呢？numbers 不是许多大量的意思吗，能用five times 修饰吗？

OG 251

OG 251

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