費費邏輯4

bfjoyce

4. The gray squirrel, introduced into local woodlands ten years ago, threatens the indigenous population of an endangered owl species, because the squirrels’ habitual stripping of tree bark destroys the trees in which the owls nest. Some local officials have advocated setting out poison for the gray squirrels. The officials argue that this measure, while eliminating the squirrels, would pose no threat to the owl population, since the poison would be placed in containers accessible only to squirrels and other rodents
Which one of the following, if true, most calls into question the officials’ argument?
(A) One of the species whose members are likely to eat the poison is the red squirrel, a species on which owls do not prey.
(B) The owls whose nesting sites are currently being destroyed by the gray squirrels feed primarily on rodents.
(C) No indigenous population of any other bind species apart from the endangered owls is threatened by the gray squirrels.
(D) The owls that tare threatened build their nests in the tops of trees, but the gray squirrels strip away back from the trunks.
(E) The officials’ plan entails adding the poison to food sources that are usually eaten by rodents but not by other animals.

小女子確實知道A、E部隊，但BCD有些模糊，請各位牛仁幫幫忙，謝囉

kathy72

B正确. OWLS 吃 RODENTS, 而RODENTS 吃毒药, 那OWLS 不就被毒死了吗. 因此该方法不能起到保护OWLS的作用.

C 说 SQUIRRELS 只威胁到这种OWLS,威胁不到其他SPECIES. 但是是否威胁到其他SPECIES与本文无关, 本文就是讨论如何解除SQUIRRELS 对这种濒临绝种的OWLS的威胁.

D 说 OWLS住在树顶, SQUIRRELS 只吃树干的树皮. 但是, 树干的树皮被吃掉了, 树也就活不了了. 因此有必要毒死SQUIRRELS. 因此D不是削弱, 而是支持了.

bfjoyce

Thinks!

seanql

我的理解是rodents都被毒死了之后，owl没东西可吃了，从而证明poison也会对owl有影响