[讨论]GWD-11-27

haha666

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 council 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?

A  Every year a certain percentage of crabs are caught by fishermen as bait for eel traps.

B  Horseshoe crabs are so prolific that given favorable circumstances their numbers increase rapidly.

C  On average, tourists who come to the town in order to watch birds spend more money there than tourists who come for other purposes.

D  The additional land made available by the reclamation project will give migrating shorebirds more space.

E  Some of the migrating shorebirds make only one stop during their migration form South America to Canada.

请问一下D为什么错?

那个Birdwatcher说“它们都是在crab筑巢时碰巧暴露的时候吃eggs”这个信息有什么用？

[此贴子已经被作者于2009/7/28 19:50:15编辑过]

haha666

up~~~~

xiaolishally

同问

lijiahui0422

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.

应该是这个事件（鸟碰上没盖好的蛋）发生的概率本身不大，而density下降会导致这个概率更小，D more space 与题目无关

haha666

以下是引用lijiahui0422在2009/7/28 8:05:00的发言：

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.

应该是这个事件（鸟碰上没盖好的蛋）发生的概率本身不大，而density下降会导致这个概率更小，D more space 与题目无关

看来是我理解问题了....我以为是乘crab不注意时偷蛋...现在crabs多了，偷蛋容易被发现，空间大点容易他们下手.......- -||||

[此贴子已经被作者于2009/7/28 20:04:24编辑过]