求教：FeiFei里三道CR

甯西西 · 发表于 2011-10-28 20:35:01

21. Historian: Wecan learn about the medical history of individuals through chemical analysis oftheir hair. It is likely, for example, that Isaac Newton’s psychologicalproblems were due to mercury poisoning; traces of mercury were found in hishair. Analysis is now being done on a lock of Beethoven’s hair. Although noconvincing argument has shown that Beethoven ever had a venereal disease, somepeople hypothesize that venereal disease caused his deafness. Since mercury wascommonly ingested in Beethoven’s time to treat venereal disease, if researchersfind a trace of mercury in his hair, we can conclude that this hypothesis iscorrect.

Which one of thefollowing is an assumption on which the historian’s argument depends?

A. None of the mercury introduced into thebody can be eliminated.
B. Some people in Beethoven’s time did notingest mercury.
C. Mercury is an effective treatment forvenereal disease.
D. Mercurypoisoning can cause deafness in people with venereal disease.
E. Beethoven suffered from psychologicalproblems of the same severity as Newton’s.

Thereshould be 2 assumptions to support the hypothesis. The 1st assumption of theauthor is that only venereal disease will be treated by mercury inBeethoven’s time. The 2nd assumption is only some people in Beethoven'stime will ingest mercury, if all people ingest mercury, the evidence is notuseful. So, some people in Beethoven's time did not ingest mercury. Theanswer should be B.

A,E have nothing to do with the argument.
Cis not necessary, 'Since mercury was commonly ingested in Beethoven’s time totreat venereal disease' is enough.
Dis wrong: according to the author, it is the venerealdisease that will cause the deafness, not the mercury poison.

23. On a certainday, nine scheduled flights on Swift Airlines were canceled. Ordinarily, acancellation is due to mechanical problems with the airplane scheduled for acertain flight. However, since it is unlikely that Swift would have themechanical problems with more than one or two scheduled flights on a singleday, some of the nine cancellations were probably due to something else.
The argument depends on which one of the following assumptions?

A. More than one or two airplanes werescheduled for the nine canceled flights.
B. Swift Airlines has fewer mechanicalproblems than do other airlines of the same size.
C. Each of the canceled flights would havebeen longer than the average flight on Swift Airlines.
D. SwiftAirlines had never before canceled more than one or two scheduled flights on asingle day.
E. All of the airplanes scheduled for thecanceled flights are based at the same airport.

参考答案：A采用取非法。
思路：否定Morethan one or two airplanes were scheduled for the nine canceled flights.将削弱作者的结论。

A：取非削弱
B：无关。
C：无关。
D：无关。
E：无关。

61. Investigators concluded that human failure was not responsible for the fatal airplane crash last August, and since that time new and more stringent rules for identifying and reporting mechanical problems have been in effect. That accounts for the fact that reports of airplane mechanical problems have increased in frequency by 50 percent since last August.
Which one of the following is an assumption underlying the argument in the passage? A. Airplane travel is still relatively safe, despite the increase in reported mechanical problems.
B. Mechanical problems in airplanes have increased dramatically since last August.
C. Mechanical problems in airplanes have not increased by 50 percent since last August.
D. Airlines are less reluctant to report mechanical problems than they previously were.
E. Mechanical problems in airplanes have become easier to detect since last August.

A. 文中第一句the fatal airplane crash last August已经客观存在，说明飞机旅行并非相当安全。与文中事实相反。
B. 用于识别和报告机械故障问题的更加严格的新规定已经生效，这才是the fact that reports of airplane mechanical problems have increased in frequency by 50 percent since last August的真正原因。而B选项Mechanical problems in airplanes是它因，削弱结论。
C. 正确。“Mechanical problems in airplanes have increased by 50 percent since last August”是用他因来削弱结论，加上NOT，则是排除他因的假设。
D. 诉诸于航空公司的主观意愿，与过去相比较，都跟现在的情况无关。
E. become easier to detect无关词。

看了解释，还是不懂。错误和无关项搞明白了，可是正确选项到底为什么正确啊？？取非怎么操作，什么时候用啊？迷茫中。。。后天就考了，泪

加一题GWD3-Q17:
Brochure: Help conserve our city’s water supply. By converting the landscaping in your yard toa water-conserving landscape, you can greatly reduce your outdoor wateruse. A water-conserving landscape isnatural and attractive, and it also saves you money.
Criticism: For most people with yards, the savings fromconverting to a water-conserving landscape cannotjustify the expense of new landscaping, since typically the conversionwould save less than twenty dollars on a homeowner’s yearly water bills.
Which of thefollowing, if true, provides the best basis for a rebuttal of the criticism?
A. Even homeowners whose yards do not havewater-conserving landscapes can conserve water by installing water-savingdevices in their homes.
B. Aconventional landscape generally requires a much greater expenditure onfertilizer and herbicide than does a water-conserving landscape.
C. A significant proportion of the residents ofthe city live in buildings that do not have yards.
D. It costs no more to put in water-conservinglandscaping than it does to put in conventional landscaping.
E. Some homeowners use more water to maintaintheir yards than they use for all other purposes combined.

求教：FeiFei里三道CR

所属分类: GMAT考试

正在浏览此版块的会员 ()