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题库 / GMATAdvanced-CR-40
First discovered several years ago in North American lakes and rivers, the northern snakehead is a nonnative fish with no local predators. To keep the northern snakehead ’s population from growing, for the past three years wildlife officials have been paying recreational fishers for each northern snakehead they catch. In this way, the officials hope to stop the northern snakeheads from eliminating rare native fish species.
To evaluate the likelihood that the wildlife officials’ plan will succeed, it would be most useful to determine which of the following?
Whether the northern snakehead’s population in local lakes and rivers could be reduced by introducing predators from its native habitat
How local population numbers of rare native fish species have been changing since the wildlife officials started paying recreational fishers to catch northern snakeheads
Whether the fish species on which the northern snakehead preys in regions to which it is native and in which it is abundant have become significantly depleted in recent decades
What total number of northern snakehead have been caught by recreational fishers since the wildlife officials began paying for them
Whether rare native fish species in the region face any threats to their survival other than the proliferation of northern snakehead
目标：stop the northern snakeheads from eliminating rare native fish species. --让ns无法抓稀有鱼
方案： paying recreational fishers for each northern snakehead they catch.-- 让fisher来catch ns，从而控制ns的数量
然后就可以发现ns减少了和让ns无法抓稀有鱼之间有个gap，【fisher抓ns】 和 【ns抓稀有鱼】 之间没有建立联系
B：fisher抓ns和稀有鱼减少之间有联系，正好弥补了这个gap。这是一道典型的搭桥假设题。
B：How local population numbers of 【rare native fish species】 have been changing since the wildlife officials started 【paying recreational fishers】 to 【catch northern snakeheads】。（最相关）
自从野生动物官员开始【付钱给休闲渔民】去【捕捉北方蛇头】后，当地【珍稀本土鱼类】的种群数量发生了怎样的变化
E没有讲pay fisher
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