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那个是记得是一个什么样的鱼，不是本地的，然后吃一种白色的鱼的卵，然后政府要保护白色的鱼，采取了一些措施 这题是GWD中的, 我怎么就不记得GWD里有呢?哪位知道请说一下.
那是 81.1 The Eurasian ruffe, a fish species inadvertently introduced into North America’s Great Lakes in recent years, feeds on the eggs of lake whitefish, a native species, thus threatening the lakes’ natural ecosystem. To help track the ruffe’s spread, government agencies have produced wallet-sized cards about the ruffe. The cards contain pictures of the ruffe and explain the danger they pose; the cards also request anglers to report any ruffe they catch. Which of the following, if true, would provide most support for the prediction that the agencies’ action will have its intended effect? A. The ruffe has spiny fins that make it unattractive as prey. B. Ruffe generally feed at night, but most recreational fishing on the Great Lakes is done during daytime hours. C. Most people who fish recreationally on the Great Lakes are interested in the preservation of the lake whitefish because it is a highly prized game fish. D. The ruffe is one of several nonnative species in the Great Lakes whose existence threatens the survival of lake whitefish populations there. E. The bait that most people use when fishing for whitefish on the Great Lakes is not attractive to ruffe. 一道加强题，答案是C，才刚做完这题不久，HHP依你的实力CR不难啦，别慌，慢慢来。  | 
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发表于 2005-1-21 19:00:00
楼主
) 多谢!!!!!!!!!!!!!!!!!!!!!!!!!