几道逻辑，请NN们帮忙！

clairette

1.Although the ratio of physicians to total population is about thesame in the United States and Canada， the United States has 33 percentmore surgeons per capita. Clearly， this is the reason people in theUnited States undergo 40 percent more operations per capita than doCanadians.
The explanation given above rests on an assumption that

（A） patients in the United States do not have a greater need for surgery than do patients in Canada

（B） the population of the United States is not larger than that of Canada

（C） United States patients sometimes travel to Canada for certain kinds of surgery

（D） General practitioners in the United States do not as a ruleexamine a who is a candidate for surgery before sending the patient toa surgeon.

（E） There are no unnecessary surgical operations performed in Canada.




答案是A 。CD肯定不对，但是ABE的差别在哪呢？对正确选项没有感觉！麻烦高手分析下，谢谢！




18.The value of a product is determined by the ratioof its quality to its price. The higher the value of a product, thebetter will be its competitive position. Therefore, either increasingthe quality or lowering the price of a given product will increase thelikelihood that consumer will select that product rather than acompeting one.Which of the following, if true, would most strengthenthe conclusion drawn above?

　　（A） It is possible to increase both the quality and the price of a product without changing its competitive position.
　　（B） For certain segments of the population of consumers, higher-pricedbrands of some product lines are preferred to the lower-priced brands.
　　（C） Competing products often try to appeal to different segments of the population of consumers.
　　（D） The competitive position of a product can be affected by such factors as advertising and brand loyalty.
　　（E） Consumers' perceptions of the quality of a product are based on the actual quality of the product.

A为什么不对，答案是E.




Despite the approach of winter, oil prices to industrial customers areexceptionally low this year and likely to remain so. Therefore, unlessthe winter is especially severe, the price of natural gas to industrialcustomers is also likely to remain low.

Which of the following, if true, provides the most support for the conclusion above?

(A) Long-term weather forecasts predict a mild winter.
(B) The industrial users who consume most natural gas can quickly and cheaply switch to using oil instead.
(C) The largest sources of supply for both oil and natural gas are insubtropical regions unlikely to be affected by winter weather.
(D) The fuel requirements of industrial users of natural gas are not seriously affected by the weather.
(E) Oil distribution is more likely to be affected by severe winter weather than is the distribution of natural gas.

答案是B.可是E为什么不对呢？




If the public library shared by the adjacent towns of Redville andGlenwood were relocated from the library’s current, overcrowdedbuilding in central Redville to a larger, available building in centralGlenwood, the library would then be within walking distance of a largernumber of library users. That is because there are many more peopleliving in central Glenwood than in central Redville, and peoplegenerally will walk to the library only if it is located close to theirhomes.
10. Which one of the following, if true, most strengthens the argument?
(A) The public library was located between Glenwood and Redville beforebeing moved to its current location in central Redville.
(B) The area covered by central Glenwood is approximately the same size as that covered by central Redville.
(C) The building that is available in Glenwood is smaller than an alternative building that is available in Redville.
(D) Many of the people who use the public library do not live in either Glenwood or Redville.
(E) The distance that people currently walk to get to the library is farther than what is generally considered walking distance.

答案是B，E为什么不对呢？迷茫。




22. For the writers who first gave feudalism its name, the existenceof feudalism presupposed the existence of a noble class. Yet therecannot be a noble class, properly speaking, unless both the titles thatindicate superior, noble status and the inheritance of such titles aresanctioned by law. Although feudalism existed in Europe as early as theeighth century, it was not until the twelfth century, when many feudalinstitutions were in decline, that the hereditary transfer of legallyrecognized titles of nobility first appeared.

　　The statements above, if true, most strongly support which one of the following claims？

　　（A） To say that feudalism by definition requires the existence of a nobility is to employ a definition that distorts history.

　　（B） Prior to the twelfth century, the institution of European feudalism functioned without the presence of a dominant class.

　　（C） The fact that a societal group has a distinct legal status isnot in itself sufficient to allow that group to be properly considereda social class.

　　（D） The decline of feudalism in Europe was the only cause of the rise of a European nobility.

　　（E） The prior existence of feudal institutions is a prerequisitefor the emergence of a nobility, as defined in the strictest sense ofthe term.




答案是A，为什么E 不对呢？完全不懂。。。




Questions 22-23

　　Despite improvements in treatment for asthma, the death rate formthis disease has doubled during the past decade from its previous rate.Two possible explanations for this increase have been offered. First,the recording of deaths due to asthma has become more widespread andaccurate in the past decade than it had been previously. Second, therehas been an increase in urban pollution. However, since the rate ofdeaths due to asthma has increased dramatically even in cities withlong-standing, comprehensive medical records and with little or nourban pollution, one must instead conclude that the cause of increaseddeaths is the use of bronchial inhalers by asthma sufferers to relievetheir symptoms.

　　22. Each of the following , if true, provides support to the argument EXCEPT：

　　（A） Urban populations have doubled in the past decade.

　　（B） Records of asthma deaths are as accurate for the past twenty years as for the past ten years.

　　（C） Evidence suggests that bronchial inhalers make the lungs more sensitive to irritation by airborne pollen.

　　（D） By temporarily relieving the symptoms of asthma, inhalers encourage sufferers to avoid more beneficial measures.

　　（E） Ten years ago bronchial inhalers were not available as an asthma treatment.

是lSAT的一道题，答案是A，E为啥不对呢？





The excessive number of safety regulations that the federal government has placed on industry pose more serious hardships for big businesses than for small ones. Since large companies do everything on a more massive scale, they must alter more complex operations and spend much more money to meet government requirement

Which of the following, if true, would most weaken the argument above?

     (A) Small companies are less likely than large companies to have the capital reserve for

improvements.

(B) The operations of small companies frequently rely on the same technologies as the operations of large companies.

      (C) Safety regulation codes are uniform, established without reference to size of company.

(D) Large companies typically have more of their profits invested in other business than do smal companies.

(E) Large companies are in general more likely than small companies to diversity the markets and products.

答案是A，为什么呢。。。。




84Fares on the city-run public buses in Greenville aresubsidized by city tax revenues, but among the beneficiaries of the lowfares are many people who commute from outside the city to jobs inGreenville. Some city councilors argue that city taxes should be usedprimarily to benefit the people who pay them, and therefore that busfares should be raised enough to cover the cost of the service.

　　Each of the following, if true, would weaken the argument advanced by the city councilors EXCEPT：

　　（A） Many businesses whose presence in the city is beneficial tothe city抯 taxpayers would relocate outside the city if public-transitfare were more expensive.

　　（B） By providing commuters with economic incentives to drive towork, higher transit fares would worsen air pollution in Greenville andincrease the cost of maintaining the city's streets.

　　（C） Increasing transit fares would disadvantage those residents ofthe city whose low incomes make them exempt from city taxes, and allcity councilors agree that these residents should be able to takeadvantage of city-run services.

　　（D） Voters in the city, many of whom benefit from the low transit fares are strongly opposed to increasing local taxes.

　　（E） People who work in Greenville and earn wages above the nationally mandated minimum all pay the city wage tax of 5 percent.

答案是D，D,E能解释下么？

就这些了，谢谢NN们！！！