求教OG Verbal SC 92

Leonyc

OG Verbal  SC 92

Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of   ( the freshwater snails that are the parasite's hosts for part of its life cycle. )

(A) the freshwater snails that are the parasite's hosts for part of its life cycle
(B) the freshwater snails that are the parasite's hosts in part of their life cycle
(C) freshwater snails which become the parasite's hosts for part of its life cycles
(D) freshwater snails which become the hosts of the parasite during the parasite's life cycle
(E) parasite's hosts, freshwater snails which become their hostsduring their life cycles

答案是A。我当时选了B，后来一看their 和 life cycle 单复数不一致，貌似是这题的突破口。
这是OG对B错误选项的解释：The preposition IN is inappropriate for expressing duration; the plural possessive pronoun THEIR does not agree with the singular antecedent PARASITE. 我看了OG的解释以后问题又来了。
1. B里面的 in part of their life cycle 如果是修饰snails的话， in的用法应该没问题吧。从语义上好像也没有明确的指引这个pronoun到底是指代parasite 还是 snails.  
2. 从A选项可以得出，A is B's host for B's life用for. 如果想表达duration in A's life, 应该用A is B's host for A's life 还是 A is B's host in A's life ？
3. A选项里面的parasite's hosts for part of its life cycle貌似和manhattan GMAT SC里的概念不一致。在MG里面pronoun的部分讲过pronoun的指代不优先possessive的形式，从这点看A反而不如B好。。到底在GMAC的标准里有没有这个preference?


求大牛请现身解惑！

MikaT

哇~~

熊大大

不是说一个句子里面的指代词都要指代同一个东西，划线处前面的it已经用来指代disease了吧？

danielsu

师兄

Jagabee

babybearmm 发表于 2012-4-16 03:41
类似的题目The army cutworm moth is a critical source of fat for as many as a third of Yellowstone Na ...

谢谢baby姐的举的类似题目， 过去了将近五年还是对后辈很有帮助.

这道题现在在网上很难找到这么好的解释，原来ron只在video里讲过这题。

jacknwsj

In B and E, their (plural) cannot serve to refer to the worm (singular).
Eliminate B and E.

A life cycle is defined as the series of stages through which a living thing passes during the course of its life.
A living thing cannot have more than one life cycle.
Incorrect: a tiger's life cycles
Correct: a tiger's LIFE CYCLE
Thus, in C and D, life cycles (plural) does not convey the intended meaning.
Eliminate C and D.

Leonyc

类似的题目
The army cutworm moth is a critical source of fat for as many as a third of Yellowstone National Park's grizzly bears; they overturn rocks to find them, as many as 40,000 per bear in a single day.

(A) bears; they overturn rocks to find them, as many as
(B) bears; overturning rocks to find the insects, up to
(C) bears, overturning rocks to find them, as many as
(D) bears, and they overturn rocks to find them, up to
(E) bears, which overturn rocks to find the insects, as many as

Mar 15那次Thursday w Ron. 当时Ron上课讲这道题，有同学提问，蓝色部分到底指的是rocks还是moths。Ron教我们如下推理：
1. Grammar: modifier placement
2. Logic: 全句关心的是moths，那么# of rocks就是out-of-scope.
见附件

这道题同样如此理解:
1. Grammar: parasite's host对应its life cycle
2. Logic: 如果说snail's life cycle，那纯粹是out-of-scope.

Thanks for sharing~

"问题2， A和B可以互换"
我认为，语法上当然可以互换，但这个句子，从逻辑上讲，互换根本不make sense. 如果你说
Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of the snails' life cycle.
那么这个句子根本就不make sense!
因为全句关心的是：a disease caused by a parasitic worm
所以就是扣住parasitic worm来推理. 我们只关心worm's life cycle。那么，snails' life cycle，从逻辑上看，就纯粹是out of scope.

-- by 会员 babybearmm (2012/4/16 3:20:15)

的确worm‘s life cycle更好，不过由于是从句不是主句，用这个点判断可能还是有点危险，毕竟有时候1:20-1:30理解可能会有少许偏差，个人觉得按照稳妥一点的方法区别可能速度更快一点。
谢谢baby姐跟贴哈！

-- by 会员 Leonyc (2012/4/16 3:29:52)

-- by 会员 babybearmm (2012/4/16 3:41:04)

确实如此。。
可能bear的那个例子逻辑比较明显，而且就近修饰insects，所以较好区分。parasite这题好像比较容易忽视这个点。。
谢谢baby姐的精彩讲解啊

Leonyc

受宠若惊，处女贴就受到大牛们的关注，感谢大牛们的帮助！
CD真温暖啊！

babybearmm

类似的题目
The army cutworm moth is a critical source of fat for as many as a third of Yellowstone National Park's grizzly bears; they overturn rocks to find them, as many as 40,000 per bear in a single day.

(A) bears; they overturn rocks to find them, as many as
(B) bears; overturning rocks to find the insects, up to
(C) bears, overturning rocks to find them, as many as
(D) bears, and they overturn rocks to find them, up to
(E) bears, which overturn rocks to find the insects, as many as

Mar 15那次Thursday w Ron. 当时Ron上课讲这道题，有同学提问，蓝色部分到底指的是rocks还是moths。Ron教我们如下推理：
1. Grammar: modifier placement
2. Logic: 全句关心的是moths，那么# of rocks就是out-of-scope.
见附件

这道题同样如此理解:
1. Grammar: parasite's host对应its life cycle
2. Logic: 如果说snail's life cycle，那纯粹是out-of-scope.

Thanks for sharing~

"问题2， A和B可以互换"
我认为，语法上当然可以互换，但这个句子，从逻辑上讲，互换根本不make sense. 如果你说
Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of the snails' life cycle.
那么这个句子根本就不make sense!
因为全句关心的是：a disease caused by a parasitic worm
所以就是扣住parasitic worm来推理. 我们只关心worm's life cycle。那么，snails' life cycle，从逻辑上看，就纯粹是out of scope.

-- by 会员 babybearmm (2012/4/16 3:20:15)

的确worm‘s life cycle更好，不过由于是从句不是主句，用这个点判断可能还是有点危险，毕竟有时候1:20-1:30理解可能会有少许偏差，个人觉得按照稳妥一点的方法区别可能速度更快一点。
谢谢baby姐跟贴哈！

-- by 会员 Leonyc (2012/4/16 3:29:52)

Leonyc

Thanks for sharing~

"问题2， A和B可以互换"
我认为，语法上当然可以互换，但这个句子，从逻辑上讲，互换根本不make sense. 如果你说
Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of the snails' life cycle.
那么这个句子根本就不make sense!
因为全句关心的是：a disease caused by a parasitic worm
所以就是扣住parasitic worm来推理. 我们只关心worm's life cycle。那么，snails' life cycle，从逻辑上看，就纯粹是out of scope.

-- by 会员 babybearmm (2012/4/16 3:20:15)

的确worm‘s life cycle更好，不过由于是从句不是主句，用这个点判断可能还是有点危险，毕竟有时候1:20-1:30理解可能会有少许偏差，个人觉得按照稳妥一点的方法区别可能速度更快一点。
谢谢baby姐跟贴哈！