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标题: PREP 19 牛牛们救命呀 [打印本页]

作者: 呼啸700 时间: 2011-3-28 20:36
标题: PREP 19 牛牛们救命呀

19.(27788-!-item-!-188;#058&003653)

With a record number of new companies starting up in Derderia and with previously established companies adding many jobs, a record number of new jobs were created last year in the Derderian economy.This year, previously established companies will not be adding as many new jobs overall as such companies added last year.Therefore, unless a record number of companies start up this year, Derderia will not break its record for new jobs created.

Which of the following is an assumption on which the argument relies?

(A) Each year, new companies starting up create more new jobs overall than do previously established companies.

(B) Companies established last year will not add a greater number of jobs overall this year than they did last year.（我的答案）

(C) This year, the new companies starting up will not provide substantially more jobs per company than did new companies last year.（答案）

(D) This year, the overall number of jobs created by previously established companies will be less than the overall number of jobs lost at those companies.

(E) The number of jobs created in the Derderian economy last year was substantially larger than the number of jobs lost last year.

短文中说的previously established companies 包括去年的成立的新公司吗？？

作者: sdcar2010 时间: 2011-3-28 20:49
短文中说的previously established companies 包括去年的成立的新公司吗？？
Yes.

Necessary assumption. Use negation.

New Job Created = Jobs created by "previously established companies" + Jobs created by "starup companies"

If you negate C, you have: This year, the new companies starting up will provide substantially more jobs per company than did new companies last year. If this is true, although no new jobs will be created by "old companies," it is possible that jobs created by "new companies" might exceed the total number of jobs created last yeart. Then the argument falls apart. So C is the necessary assumption.

作者: 呼啸700 时间: 2011-3-28 21:12
你看我是这样理解的：去年：去年本来就有的公司增加的新工作 + 去年新建立的公司创造的新工作= 去年增加的新工作=A
今年：去年增加的新工作少一些（因为文章说不会增加以前的那么多）(D)+今年新建立的公司创造的工作(C)=今年增加的新工作=B

If B>A and we know D<A; D+C=B then we will conclude that 什么呀？？你看我这个逻辑就比较乱了你按照我这个思路给我解释一下好吗？？感觉我把问题复杂化了

作者: sdcar2010 时间: 2011-3-28 21:19
A = 100 (old companies) + 200 (new companies)
B = 99 (old companies) + x (new companies)

If the conclusion says that B<A, then x has to be less than 200 (last year's new job number).

作者: sdcar2010 时间: 2011-3-28 21:20
unless a record number of companies start up this year, Derderia will not break its record for new jobs created:

Not A unless B:

If A, then B; If not B, then not A.

作者: sdcar2010 时间: 2011-3-28 21:23
In addition, the total new jobs created by new companies = number of new companies * average number of new jobs created in each new company. Even if the number of new companies drops or remains the same as last year, if the average number of new jobs per new company reaches a new height, the total number of new jobs might still be a record. C simply prevents that from happening.

作者: 呼啸700 时间: 2011-3-28 21:27
哎　我知道我的　问题到底在哪里了　　你说　：对于今年来说　previously established companies 包括去年新建的公司吗？按照你的A,B理解你的意思是说去年和今年 previously eslablished companies 指的是同一些公司。你帮我解释一下这个问题

作者: sdcar2010 时间: 2011-3-28 21:33
previously established companies 包括去年新建的公司吗？ Yes. They are consided OLD this year.

去年和今年 previously eslablished companies 指的是同一些公司。No.

Every year it is a new playground, like the NBA. Every year there will be rookies freshman coming in. Last year's rookies are called sophomores this year.

A is the total number of jobs created last year.
B is the total number of jobs created this year.

作者: 呼啸700 时间: 2011-3-29 21:04
这个题谢谢了其实昨天晚上我还是没想明白今天早上5点突然醒来躺在床上就开始想这个题我明白了

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