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这两道题我实在是想不通答案为什么是酱子，我都看了一个小时，还是想不出这是为什么，哪位好心人，大哥，大姐帮我看看呗·····
29. The number ofpeople diagnosed as having a certain intestinal disease has dropped
significantly in arural county this year, as compared to last year. Health officials attributethis
decrease entirely toimproved sanitary conditions at water-treatment plants, which made for
cleaner water thisyear and thus reduced the incidence of the disease.
Which of thefollowing, if true, would most seriously weaken the health officials’explanation for
the lower incidenceof the disease?
A. Many new water-treatment plants havebeen built in the last five years in the rural county.
B. Bottled spring water has not beenconsumed in significantly different quantities by people
diagnosed as having the intestinal disease,as compared to people who did not contract
the disease.
C. Because of a new diagnostic technique,many people who until this year would have been
diagnosed as having the intestinal diseaseare now correctly diagnosed as suffering from
intestinal ulcers.
D. Because of medical advances this year,far fewer people who contract the intestinal
disease will develop severe cases of thedisease.
E. The water in the rural county wasbrought up to the sanitary standards of the water in
neighboring counties ten years ago.
29. The health officials’ explanation assumesthat the decrease in the number of people diagnosed
with the disease accurately reflects adiminution in cases of the disease. By pointing out that
this assumption is false, C undermines theofficials’ explanation and thus is the best answer.
Since A supports the view that sanitaryconditions have been improving, it tends to support the
officials’ explanation. B also tends tosupport the officials’ explanation, because it eliminates a
factor that might have differentiatedbetween those contracting and those not contracting the
disease and thus rules out an alternativeexplanation. The reduction of the severity of the
diagnosed cases does not bear on theofficials’ explanation. So D is not correct. Since the
standards in neighboring counties mightthemselves have been inadequate, E does not
weaken the officials’ explanation.
30. The price thegovernment pays for standard weapons purchased from military contractors
is determined by apricing method called “historical costing.” Historical costing allows
contractors toprotect their profits by adding a percentage increase, based on the currentrate
of inflation, to theprevious year’s contractual price.
Which of thefollowing statements, if true, is the best basis for a criticism of historicalcosting as an economically sound pricing method for military contracts?
A. The government might continue to pay forpast inefficient use of funds.
B. The rate of inflation has variedconsiderably over the past twenty years.
C. The contractual price will be greatlyaffected by the cost of materials used for the products.
D. Many taxpayers question the amount ofmoney the government spends on military
contracts.
E. The pricing method based on historicalcosting might not encourage the development of
innovative weapons.
30.
If the original contractual price for theweapons purchased incorporated an inefficient use of
funds, then, since historical costing merelyadds to the original price, it preserves these
inefficiencies. An economically soundpricing method should at least allow the possibility of
reductions in price as such inefficienciesare removed. Hence, A is the best answer. Because
historical costing responds to inflation, Band C are consistent with the economic soundness of
historical costing-the rate of inflationand costs that are reflected in inflation. D offers no
grounds for questioning the economicsoundness of historical costing in particular. Historical
costing applies to standard weapons only,not to the innovative weapons that are mentioned in E.
谢谢大家的帮助，小的真的是感激不尽 ，不尽，再不尽 ········ |
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发表于 2011-8-21 20:33:08
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