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题库 / Prep2007E1-CR-5
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?
Even if not all the tiger sharks that come close to the beaches are killed, the existence of the program would reassure tourists.
Business owners who depend on tourism are willing to pay most of the cost of implementing the program.
Tourists come to Tenare Island for its beaches, even though the island features a number of other tourist attractions.
The small sharks on which tiger sharks prey feed on fish that are commercially important to the island's fisheries.
Not all tourists who come to Tenare Island enjoy swimming or surfing.
2.副作用提到了观光业增加的副作用，渔业的变化。
注意文中已经说到fishing才是最重要的产业，D选项指出杀虎鲨的副作用，会带来fish减少，伤害经济
C：杀光虎鲨
削弱方向：杀光虎鲨会对goal带来副作用
答案：虎鲨吃的小鲨鱼会吃那些有经济效益的鱼
in onder to...
原文中包含两方面：渔业和旅游业 最终计划中只提到一种
削弱条件：另一种！！
注意看目标是帮助整个经济，经济包括了tourism和fishing两块
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目标：to help the economy
方案：the mayor of the island has proposed an ongoing program to kill any tiger sharks within a mile of the beaches.
D. The small sharks on which tiger sharks prey feed on fish that are commercially important to the island's fisheries.
tiger sharks少了 → small sharks多了 →fish就会变少 (而这个fish对于economy至关重要) → economy可能受到影响
属于CQ3：方案的否定性副作用
而经济中渔业重要性大于旅游业。方案会损害渔业所以不可行。
方案可行性问题，D，如果tiger shark被捕杀，small shark就会吃其他的鱼，导致岛上经济出现问题。
E 错误，不要质疑premise, premise “ This has hurt Tenare's tourism industry, which is second only to its fishing industry in annual revenues.” 是已知事实。
1.fishing industry in annual revenues
2.tourism industry
方案不可行，因为会损害渔业
Thus, Sharks decrease---smaller shark increase----other fishes decrease