大全D-7

applejsjs

7.     The postal service is badly mismanaged. Forty years ago, first-class letter delivery cost only three cents. Since then, the price has increased nearly tenfold, with an actual decrease in the speed and reliability of service.
Each of the following statements, if true, would tend to weaken the argument above EXCEPT:
(A) The volume of mail handled by the postal service has increased dramatically over the last forty years.
(B) Unprecedented increases in the cost of fuel for trucks and planes have put severe upward pressures on postal delivery costs.
(C) Private delivery services usually charge more than does the postal service for comparable delivery charges.
(D) The average delivery time for a first-class letter four decades ago was actually slightly longer than it is today.（E）
(E) The average level of consumer prices overall has increased more than 300 percent over the last forty years.

这题始终不明白选了C了

14.A nutritionist studying the effects of massive doses of vitamin C found that of a group of 600 people who regularly took 1,500 mg of vitamin C daily for a year, fewer than 9 percent suffered serious cases of flu; of a group of 600 people who took 250 mg of vitamin C (the standard recommended daily allowance) daily for a year, 34 percent suffered at least one serious case of flu; and of a group of 600 people who took no vitamin C for a year (other than that found in the foods in a balanced diet), 32 percent suffered at least one serious case of flu.

Which of the following hypotheses is best supported by the evidence above?

(A) The effectiveness of vitamin C in preventing serious cases of flu increases in direct proportion to the amount of vitamin C taken.

(B) Vitamin C is helpful in preventing disease.

(C) Doses of vitamin C that exceed the standard recommended daily allowance by 500 percent will reduce the incidence of serious cases of flu by 25 percent.

(D) Massive doses of vitamin C can help to prevent serious case of flu.（D）

(E) A balanced diet contains less than 250 mg of vitamin C.
这个也不明白，选了C了

jingjane222

我选了C。。。。

pianer

我的理解是postal service is badly mismanaged.
(E) The average level of consumer prices overall has increased more than 300 percent over the last forty years.暗指不是由于邮局管理而是通货膨胀引起的价格上涨。所以削弱了

14题我也不懂，等牛牛们

poorleafes

7
argument:Forty years ago, first-class letter delivery cost only three cents. Since then, the price has increased nearly tenfold, with an actual decrease in the speed and reliability of service.
conclusion:The postal service is badly mismanaged.
argument包含了一个过去和现在的比较。要削弱这个比较，就要使这个比较不具可比性。A、B描述了以前和现在的情况的不同，削弱了可比性。C项，感觉出得不太好，它直接削弱了结论，但又不是从逻辑的角度。D直接驳斥with an actual decrease in the speed。 E项是一个支持项，它排除了非价格因素。

14
A项，effectiveness错，文章没有提到
B项，太general了，原推理只是针对flu而已
C项，32-9=23
E项，给了这多信息，就得出这么一个无关痛痒的结论？

applejsjs

我的理解是postal service is badly mismanaged.
(E) The average level of consumer prices overall has ...
pianer 发表于 2010-7-10 10:19

    谢谢，tenfold是十倍，通胀涨了3倍，说明通账不足以带来十倍的增长，所以他们还是mismanaged这样理解对吗？

applejsjs

7
argument:Forty years ago, first-class letter delivery cost only three cents. Since then, the pric ...
poorleafes 发表于 2010-7-11 08:56

    谢谢解答，第七题我一直纠结那个十倍和三倍的问题，这里说的排除非价格因素是说因为通胀只涨了三倍，所以不是通胀带来的十倍邮资的上涨，进而说明是mismanage对吗？

poorleafes

不是的，邮费是10倍，average level of consumer prices 消费者价格指数是3倍，注意这个average。邮费是计算消费者价格指数时要考察的一个项目而已。原题的逻辑是：价格涨了，服务差了，所以管理太差了。排除非价格因素，指就是因为价格涨了，所以管理太差了，而不是其他什么因素导致管理太差了。E强调了价格问题。

applejsjs

明白了，因为通胀效果，价格涨了，不是管理差导致的~~
这个300%比例太隐会，如果没注意到是个平均指数，我这样的栽的可能性太大了。
虚心学一下~~~注意这些词。