[face=Arial]Questions 18 -19
Each year, an official estimate of the stock of cod in the Grand Banks is announced. This estimate is obtained by averaging two separate estimates of how many cod are available, one based on the number of cod caught by research vessels during a once-yearly sampling of the area and the other on the average number of tons of cod caught by various commercial vessels per unit of fishing effort expended there in the past year ?a unit of fishing effort being one kilometer of net set out in the water for one hour. In previous decades, the two estimates usually agreed closely. However, for the last decade the estimate based on commercial tonnage has been increasing markedly, by about the same amount as the sampling based estimate has been decreasing.
18. If the statements in the passage are true, which one of the following is most strongly supported by them?
(A) Last year's official estimate was probably not much different from the official estimate ten years ago
(B) The number of commercial vessels fishing for cod in the Grand Banks has increased substantially over the past decade
(C) The sampling-based estimate is more accurate than the estimate based on commercial tonnage in that the data on which it relies is less likely to be inaccurate
(D) The once-yearly sampling by research vessels should be used as the sole basis for arriving at the official estimate of the stock of cod
(E) Twenty years ago, the overall stock of cod in the Grand Banks was officially estimated to be much larger than it is estimated to be today
19. Which one of the following, if true, most helps to account for the growing discrepancy between the estimate based on commercial tonnage and the research-based estimate?
(A) Fishing vessels often exceed their fishing quotas for cod and therefore often underreport the number of tons of cod that they catch
(B) More survey vessels are now involved in the yearly sampling effort than were involved 10 years ago
(C) Improvements in technology over the last 10 years have allowed commercial fishing vessels to locate and catch large schools of cod more easily
(D) Survey vessels count only those cod caught during a 30-day survey period, whereas commercial dishing vessels report all cod caught during the course of a year
(E) Because of past overfishing of cod, fewer fishing vessels now catch the maximum tonnage of cod each vessel is allowed by law to catch
这两个题目的原文把我搞晕了，请指点思路！答案分别是a/c
25. Unless negotiations begin soon, the cease-fire will be violated by one of the two sides to the dispute. Negotiations will be held only if other countries have pressured the two sides to negotiate; an agreement will emerge only if other countries continue such pressure throughout the negotiations. But no negotiations will be held until international troops enforcing the cease-fire have demonstrated their ability to counter any aggression from either side, thus suppressing a major incentive for the two sides to resume fighting.
If the statements above are true, and if negotiations between the two sides do begin soon, at the time those negotiations begin each of the following must also be true EXCEPT:
(A) The cease-fire has not been violated by either of the two sides
(B) International troops enforcing the cease-fire have demonstrated that they can counter aggression from either of the two sides
(C) A major incentive for the two sides to resume hostilities has been suppressed
(D) Other countries have exerted pressure on the two sides to the dispute
(E) The negotiations'reaching an agreement depends in part on the actions of other countries.
原文的逻辑关系把我弄晕了，请给些思路。答案是A
26. If Blankenship Enterprises has to switch suppliers in the middle of a large production run, the company will not show a profit for the year. Therefore, if Blankenship Enterprises in fact turns out to show no profit for the year, it will also turn out to be true that the company had to switch suppliers during a large production run
The reasoning in the argument is most vulnerable to criticism on which one of the following grounds?
(A) The argument is a circular argument made up of an opening claim followed by a conclusion that merely paraphrases that claim
(B) The argument fails to establish that a condition under which a phenomenon is said to occur is the only condition under which that phenomenon occurs
(C) The argument involves an equivocation, in that the work "profit" is allowed to shift its meaning during the course of the argument
(D) The argument erroneously uses an exceptional, isolated case to support a universal conclusion
(E) The argument explains one event as being caused by another event, even though both events must actually have been caused by some third, unidentified event
我选A.答案是B(奇怪)
 [/face]
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发表于 2003-5-14 22:22:00
