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题库 / Prep2012-CR-47
Mayor: Migrating shorebirds stop at our beach just to feed on horseshoe-crab eggs, a phenomenon that attracts tourists. To bring more tourists, the town plans to undertake a beach reclamation project to double the area available to crabs for nesting.
Birdwatcher: Without a high density of crabs on a beach, migrating shorebirds will go hungry because shorebirds only eat eggs that a crab happens to uncover when it is digging its own nest.
Which of the following, if true, would provide the mayor with the strongest counter to the birdwatcher's objection?
Every year a certain percentage of crabs are caught by fishermen as bait for eel traps.
Horseshoe crabs are so prolific that given favorable circumstances their numbers increase rapidly.
On average, tourists who come to the town in order to watch birds spend more money there than tourists who come for other purposes.
The additional land made available by the reclamation project will give migrating shorebirds more space.
Some of the migrating shorebirds make only one stop during their migration from South America to Canada.
市长：迁徙水鸟在我们海滩吃蟹蛋，吸引了旅游者。为了带来更多旅游者，城市计划扩建倍增海滩面积，让蟹来筑巢。
鸟类学家：如果海滩蟹的密度不高，迁徙水鸟会挨饿，因为鸟只吃蟹挖巢偶尔露出的蛋; 要支持市长，削弱鸟类学家观点
A. 每年部分蟹被诱饵抓获；无关
B. 蟹的繁殖率高，给了好条件，数量增长很快；削弱条件，正确
C. 旅行者花钱的对比；无关
D. 开垦增加的土地为鸟提供更多空间；鸟越多，更容易挨饿，增强鸟类学家观点，方向反
E. 某些鸟迁徙中只一站停留；无关
错选了D
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