天山-3-24（以前没讨论过）

24，Each year red-winged blackbirds stop in a certain region of Midland Province on their spring and fall migrations. In the fall, they eat a significant portion of the province's sunflower crop. This year Midland farmers sought permits to set out small amounts of posioned rice during the blackbirds' spring stop in order to reduce the fall blackbird poplution. Some residents voiced concern that the rice could threaten certain species of rare migratory birds. Nevertheless, the wildlife agency approved the permits.

Which of the following, if true, most helps to justify the widlife agency's approved of the permits, given the conerns voiced by some residents?

A .In the region where the red-winged blackbirds stop, they are the first birds to be present in the spring.

B The poison that farmers want to use does not koll birds  but rather makes them incapable of producing viable eggs.

C. Since rice is not raised in Midland Province, few species of birds native to the province normally eat rice.

D .Without the permit, any farmers shown to have set out poison for the blackbirds would be heavily fined.

E. The posion that farmers got approval to use has no tast or smell that would make it detectable by birds.

ans:A

mine:C

请帮忙解释一下，我觉得C更有道理，文章给出的rare migratory birds.,这样的话，他们是最先出现在春天的不能保证它们一定在其他出现之前已经全部把poison吃完了。

c说birds not raised in Midland Province 也就是rare migratory birds，不吃rice，不是很对么？