逻辑我碰到另外一道GWD还是prep的原题。我记得做过，但查GWD没查到。 就是一个地方有海滩，上面很多螃蟹（crab）筑巢生蛋（eggs），有中迁徙的鸟迁徙的时候会中途停留在这里吃这个蛋，然后再迁徙。鸟吃螃蟹蛋成为一个啥景点还是啥的，很多游客来参观。当地政府于是决定做个工程，把海滩延长一倍，以此吸引更多游客。 问削弱。 原题答案我依稀记得螃蟹下蛋的数量还是什么跟螃蟹的密度有关（也就是说海滩变成原来两倍，螃蟹密度就小了）。 真记不清了， 楼主谨慎参考 -- by 会员 4mmgirl (2009/11/14 18:04:14)
这题我也觉得熟，我找找，非常感谢~~ -- by 会员 babee2queen (2009/11/15 1:22:34)
版主和4mmgirl看看是不是这个
34. GWD17-Q34:
During the month of May, crabs arrive on Delaware
’s beaches to lay eggs. Certain shorebirds depend on these eggs for food during their annual spring migration to their northern breeding grounds. Delaware’s crab population has declined recently. This decline, however, poses no serious threat to the migrating shorebird populations: by remaining longer in Delaware, the birds will be able to eat enough crab eggs to allow them to complete their migration.
Which of the following, if true, most seriously weakens the argument?
A. No other food available to the birds on Delaware
’s beaches is as nutritious and accessible as are crab eggs.
B. The decline in the number of crabs on Delaware
’s beaches is due to the harvesting of crabs by humans.
C. There are more crabs on Delaware
’s beaches than in any other area that the migrating birds pass through.
D. The crabs do not conceal their eggs.
E. The earlier in the season the shorebirds complete their migration, the more likely they are to breed successfully. | 
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发表于 2009-11-16 16:31:12
