【求助GWD TN24一道题~~】

水色青空 · 发表于 2010-2-25 18:56:08

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.

文章说一种螃蟹在五月的时候去D 下蛋，而某种鸟在每年春天迁徙的时候以螃蟹的蛋为食。D的螃蟹数量最近下降了，但是这种下降并不会威胁到迁徙的鸟的数量，由于呆在D的时间长，鸟有能力吃足够的蛋去完成迁徙。
E选项说越早完成迁徙，就能越成功的完成繁殖。(BREEDING)，这个能削弱么？貌似没有削弱啊....不理解...
nn指教~~
文章说一种螃蟹在五月的时候去D 下蛋，而某种鸟在每年春天迁徙的时候以螃蟹的蛋为食。D的螃蟹数量最近下降了，但是这种下降并不会威胁到迁徙的鸟的数量，由于呆在D的时间长，鸟有能力吃足够的蛋去完成迁徙。
E选项说越早完成迁徙，就能越成功的完成繁殖。(BREEDING)，这个能削弱么？貌似没有削弱啊....不理解...
nn指教~~

水色青空 · 发表于 2010-3-6 16:56:02

帮帮忙吧~~~~

水色青空 · 发表于 2010-3-6 16:56:16

顶~

【求助GWD TN24一道题~~】

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