CR归纳等精讲精练.docx

1、CR归纳等精讲精练1. Finding of a survey of Systems magazine subscribers: Thirty percent of all merchandise orders placed by subscribers in response to advertisements in the magazine last year were placed by subscribers under age thirty-five.Finding of a survey of advertisers in Systems magazine: Most of the

2、 merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five.For both of the findings to be accurate, which of the following must be true?(A) More subscribers to Systems who have never ordered merchandise in response to advertisements in t

3、he magazine are age thirty-five or over than are under age thirty-five.(B) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now.(C) Most merchandise orders placed in response to advertisements in Systems last year were placed by S

4、ystems subscribers over age thirty-five.(D) Last year, the average dollar amount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over.(E) Last year many people who placed orders for merchandise in response to advertisements in Systems wer

5、e not subscribers to the magazine.正选 EA 从来没有对这些做出反应的 讨论范围改变B now （题目中为 last year）*2. Which of the following most logically completes the argument?United States manufacturers currently produce most of the worlds solar-power generators-most of which are exported to Europe. However, European manufactur

6、ers are emerging and probably will ultimately capture much of the European market. The United States government is funding initiatives intended to encourage use of solar power within the United States. If these initiatives succeed in increasing the demand for solar-power generators in the United Sta

7、tes, United States manufacturers will probably maintain significant production levels, since _.(A) some United States manufacturers have been substantially increasing their output over the last several years(B) the efficiency of solar-power generators in converting energy from the Sun into electric

8、power is not improving as fast as it once did(C) just as European manufacturers enjoy certain competitive advantages in Europe, so do United States manufacturers in the United States(D) European governments are currently undertaking initiatives to stimulate the use of solar power within Europe(E) th

9、e current market for solar-power generators in the United States is very limited正选 C 3. Astronomer: Observations of the Shoemaker-Levi comet on its collision course with Jupiter showed that the comet broke into fragments before entering Jupiters atmosphere in 1994, but they did not show how big thos

10、e fragments were. In hopes of gaining some indication of the fragments size, astronomers studied spectrographic analyses of Jupiters outer atmosphere. These analyses revealed unprecedented traces of sulfur after the fragments entry. The fragments themselves almost certainly contained no sulfur, but

11、many astronomers believe that the cloud layer below Jupiters outer atmosphere does contain sulfur. Since sulfur would have seeped into the outer atmosphere if comet fragments had penetrated this cloud layer, it is likely that some of the fragments were at least large enough to have passed through Ju

12、piters outer atmosphere without being burned up.Since A,B B 为文章结论两句话之间无转折词 所以不是against的关系 challenge ；at issue ；into questionIn the astronomers argument, the two portions in boldface play which of the following roles?(A) The first presents a circumstance for which the astronomer offers an explanation

13、; the second is part of that explanation.(B) The first acknowledges a consideration that weighs against the conclusion of the argument; the second is that conclusion.(C) The first acknowledges a consideration that weighs against the conclusion of the argument; the second provides evidence in support

14、 of that conclusion.(D) The first provides evidence in support of the conclusion of the argument; the second acknowledges a consideration that weighs against that conclusion.(E) The first is a judgment advanced in support of the conclusion of the argument; the second is that conclusion.4. Many small

15、 roads do not have painted markings along their edges. Clear edge markings would make it easier for drivers to see upcoming curves and to judge the cars position on the road, particularly when visibility is poor, and would therefore seem to be a useful contribution to road safety. However, after Gre

16、atwater County painted edge markings on all its narrow, winding roads, the annual accident rate along those roads actually increased slightly.Which of the following, if true, most helps to explain the increase in accident rate?(A) Greatwater County has an unusually high proportion of narrow, winding

17、 roads.(B) In bad weather it can be nearly as difficult for drivers to see the road as it is at night.(C) Prior to the painting of the edge markings, Greatwater Countys narrow, winding roads already had a somewhat higher accident rate than other Greatwater County roads.(D) Many of the accidents on n

18、arrow, winding roads involve a single vehicle veering off the road, rather than the collision of two vehicles.(E) After the markings were painted on the roads, many drivers who had gone out of their way to avoid driving on those roads at night no longer did so.5. From 1978 to 1988, beverage containe

19、rs accounted for a steadily decreasing percentage of the total weight of household garbage in the United States. The increasingly widespread practice of recycling aluminum and glass was responsible for most of this decline. However, although aluminum recycling was more widely practiced in this perio

20、d than glass recycling, it was found that the weight of glass bottles in household garbage declined by a greater percentage than the weight of aluminum cans.Which of the following, if true of the United States in the period 1978 to 1988, most helps to account for the finding?(A) Glass bottles are si

21、gnificantly heavier than aluminum cans of comparable size.(B) Recycled aluminum cans were almost all beverage containers, but a significant fraction of the recycled glass bottles had contained products other than beverages.(C) Manufacturers replaced many glass bottles, but few aluminum cans, with pl

22、astic containers.(D) The total weight of glass bottles purchased by households increased at a slightly faster rate than the total weight of aluminum cans.(E) In many areas, glass bottles had to be sorted by color of the glass before being recycled, whereas aluminum cans required no sorting.下降比率要想到基数

23、6. The population of Megacity, a sprawling metropolis in Remsland, has grown at a fairly steady rate for over a century. A hundred years ago, poor sanitation in the city caused high mortality rates among the citys inhabitants, and what fueled the population increase was immigration from rural villag

24、es. This immigration has continued and even increased. Moreover, in recent decades, city sanitation has improved enormously. Yet the citys population growth has not significantly accelerated.Which of the following, if true, most helps to explain why the citys population growth rate has not changed?(

25、A) Mortality rates that were associated with poor sanitation in Megacity a hundred years ago were orders of magnitude higher than are mortality rates associated with vehicular traffic, which is currently a major cause of death in the city.(B) For several decades, Megacity, as distinct from the count

26、ryside, has had a steadily declining birth rate.(C) Cities smaller than Megacity have also experienced sustained population growth.(D) The great majority of immigrants to Remsland settle in Megacity, at least initially.(E) Megacity has long offered better employment prospects than most rural areas.正

27、选: B 另一个解释人数少的原因：出生率少7. Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage. Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones. Thus, for most f

28、armers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer. However, since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise, the use of genetically engineered seeds of this kind is like

29、ly to become widespread.In the argument given, the two portions in boldface play which of the following roles?(A) The first supplies a context for the argument; the second is the arguments main conclusion.(B) The first introduces a development that the argument predicts will have a certain outcome;

30、the second is a state of affairs that the argument denies will be part of that outcome.(C) The first presents a development that the argument predicts will have a certain outcome; the second acknowledges a consideration that weighs against that prediction.(D) The first provides evidence to support a

31、 prediction that the argument seeks to defend; the second is that prediction.(E) The first and the second each provide evidence to support the arguments main conclusion.A 对立关系 错B 是argument accepts8.归纳题 First-time computer buyers buying PXC home computers typically buy models that cost much less and

32、have a smaller profit margin per computer than do PXC computers bought by people replacing their computers with more powerful models. Last year PXCs profits from computer sales were substantially higher than the previous year, although about the same number of PXC computers were sold and the prices and profit margins for each computer model that PXC sells remained unchanged.If the statements above are true, which of the following is most strongly supported by them?(A) PXCs competitors raised the prices on their computers last year, m