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黑体是我做错的，红色是答案，请高人解答
5. (24371-!-item-!-188;#058&000859)
Tiger sharks are common in the waters surrounding Tenare Island. Usually tiger sharks feed on smaller sharks, but sometimes they have attacked tourists swimming and surfing at Tenare's beaches. This has hurt Tenare's tourism industry, which is second only to its fishing industry in annual revenues. In order to help the economy, therefore, the mayor of the island has proposed an ongoing program to kill any tiger sharks within a mile of the beaches.
Which of the following, if true, most strongly calls into question the likelihood that implementation of the mayor's proposal will have the desired consequence?
(A) Even if not all the tiger sharks that come close to the beaches are killed, the existence of the program would reassure tourists. (B) Business owners who depend on tourism are willing to pay most of the cost of implementing the program. (C) Tourists come to Tenare Island for its beaches, even though the island features a number of other tourist attractions. (D) The small sharks on which tiger sharks prey feed on fish that are commercially important to the island's fisheries. (E) Not all tourists who come to Tenare Island enjoy swimming or surfing.
20. (28411-!-item-!-188;#058&003617)
For years the beautiful Renaissance buildings in Palitito have been damaged by exhaust from the many tour buses that come to the city. There has been little parking space, so most buses have idled at the curb during each stop on their tour, and idling produces as much exhaust as driving. The city has now provided parking that accommodates a third of the tour buses, so damage to Palitito's buildings from the buses' exhaust will diminish significantly.
Which of the following, if true, most strongly supports the argument?
(A) The exhaust from Palitito's few automobiles is not a significant threat to Palitito's buildings. (B) Palitito's Renaissance buildings are not threatened by pollution other than engine exhaust. (C) Tour buses typically spend less than one-quarter of the time they are in Palitito transporting passengers from one site to another. (D) More tourists come to Palitito by tour bus than by any other single means of transportation. (E) Some of the tour buses that are unable to find parking drive around Palitito while their passengers are visiting a site.
22. (28829-!-item-!-188;#058&003748)
In the late 1980s, the population of sea otters in the North Pacific began to decline. There are two plausible explanations for the decline: predation, possibly by killer whales, or disease. Of these two, disease is the more likely, since a concurrent sharp decline in populations of seals and sea lions is believed to have been caused by disease, and diseases that infect these creatures are likely to be able to infect sea otters also.
Which of the following, if true, most seriously weakens the reasoning?
(A) Killer whales in the North Pacific usually prey on seals and sea lions but will, when this food source is scarce, seek out other prey. (B) There is no indication that the sea otter population at any North Pacific location declined in the 1980s because of substantial numbers of sea otters migrating to other locations. (C) Along the Pacific coast of North America in the 1980s, sea otters were absent from many locations where they had been relatively common in former times. (D) Following the decline in the population of the sea otters, there was an increase in the population of sea urchins, which are sea otters' main food source. (E) The North Pacific populations of seals and sea lions cover a wider geographic area than does the population of sea otters.
27. (31231-!-item-!-188;#058&004411)
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 farmers 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 likely 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 argument's main conclusion. (B) The first introduces a development that the argument predicts will have a certain outcome; 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 prediction that the argument seeks to defend; the second is that prediction. (E) The first and the second each provide evidence to support the argument's main conclusion.
28. (31510-!-item-!-188;#058&004526)
First-time computer buyers buying PXC home computers typically buy models that cost much less and have a smaller profit margin per computer than do PXC computers bought by people replacing their computers with more powerful models. Last year PXC's 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) PXC's competitors raised the prices on their computers last year, making PXC computers more attractive to first-time computer buyers. (B) The number of people buying PXC computers who also bought PXC computer-related products, such as printers, was larger last year than the previous year. (C) Among computer buyers who bought a PXC computer to replace their existing computer, the proportion who were replacing a computer made by a competitor of PXC was greater last year than the previous year. (D) The proportion of PXC computers bought by first-time computer buyers was smaller last year than the previous year. (E) PXC's production costs for its computers were lower last year than they had been the previous year.
52. (34413-!-item-!-188;#058&007570)
The technological conservatism of bicycle manufacturers is a reflection of the kinds of demand they are trying to meet. The only cyclists seriously interested in innovation and willing to pay for it are bicycle racers. Therefore, innovation in bicycle technology is limited by what authorities will accept as standard for purposes of competition in bicycle races.
Which of the following is an assumption made in drawing the conclusion above?
(A) The market for cheap, traditional bicycles cannot expand unless the market for high-performance competition bicycles expands. (B) High-performance bicycles are likely to be improved more as a result of technological innovations developed in small workshops than as a result of technological innovations developed in major manufacturing concerns. (C) Bicycle racers do not generate a strong demand for innovations that fall outside what is officially recognized as standard for purposes of competition. (D) The technological conservatism of bicycle manufacturers results primarily from their desire to manufacture a product that can be sold without being altered to suit different national markets. (E) The authorities who set standards for high-performance bicycle racing do not keep informed about innovative bicycle design.
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发表于 2009-7-8 21:20:00
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