[問題]GWD17-Q34

[styleko]

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.

答案是E..
這一題我選A..
想法是:因為沒有別的食物可以給鳥吃,所以一旦crabs的數量下降,那麼一定會威脅到鳥的population,所以weaken結論..

但是後來想想,E的答案也有道理,後面有一句" by remaining longer in Delaware,..." 我想應該是關鍵所在,這樣E就合理了..
請教一下大家對這一題的思路為何？

[coulomb]

A的話 因為原題一直圍繞著crab打轉 所以other food不在討論範圍之內
不管這種鳥會不會吃其他的食物都跟原題的推理無關
只有E很明確的對他的推理造成影響 所以E對

[FionaV]

B.The decline in the number of crabs on Delaware’s beaches is due to the harvesting of crabs by humans.

B錯是因為它是無關選項嗎?

[Jung]

yes, B only explain why crab number decline. But nothing explain why it might affect migrating shorebird populations