标题: 老PREP CR-5 [打印本页] 作者: 橙色的鱼 时间: 2011-7-26 21:57 标题: 老PREP CR-5 Tiger Sharks are common in the waters surrounding Tenare Island. Usually tiger sharks feed on smaller sharks, but sometimes they have attached tourists swimming and surfing at Tenare's beaches. This has hurt Tenare's tourism industry, which is secondary only to its fishing industry in annual revenues. In order to help the ecomony, 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 surfi
答案是D，麻烦牛牛帮忙解释下D的意思，横竖都读不懂了作者: sdcar2010 时间: 2011-7-26 22:02
The tiger shark eats the small sharks. The small sharks eat fish. Fishermen catch fish to sell.
Kill tiger shark would increase the number of the small shark, which would eat more fish. Fisherman would have fewer fish to sell.作者: 橙色的鱼 时间: 2011-7-26 22:12
明白了。。原来是从prey那里断开。。哎 常常读不懂题目，谢谢你了作者: hsyuibe 时间: 2011-8-17 15:46
回答得太好了，谢谢！