TN11 -Q24.
Each year red-winged blackbirds stop in a certain region of Midland Province on their spring and fall migration. 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 poisoned rice during the blackbirds’ spring stop in order to reduce the fall blackbird population. 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 wildlife agency’s approval of the permits, given the concern voiced by some residents?
梳理题目条件可得：
(1)某种候鸟迁徙的时候会在某地停歇，秋天经过的时候会吃掉该地一大部分向日葵
(2)这一年农民们请求下发一个许可，就是当候鸟春天经过的时候，在田里放一小部分毒米来控制这种候鸟的数量
(3)某些居民觉得这一行为可能会危害到一些珍稀种类的候鸟，但是野生动物部门还是准许了农民的这一申请
问哪个选项支持野生动物部门的决定。
也就是说，题目的中心论点是“毒米只会对吃农作物的特定候鸟种类起作用而不会伤害到珍稀鸟类”这一论断。
A.In the region where the red-winged blackbirds stop, they are the first birds to be present in the spring.
正解。本选项说该候鸟是春天到来的第一批候鸟，也就是说放的毒米会被该种候鸟先吃掉，因而后来的候鸟吃不到毒米，因此也不会伤害到珍稀鸟类。换句话说，这个选项提出了与因果关系有关的有利因素，support了题目结论。
B.The poison that farmers want to use does not kill birds but rather make them incapable of producing viable eggs.
本选项说农民们用的毒米不会杀死鸟儿而是让它们无法产下鸟蛋，看似没有直接威胁到鸟类生命但是对珍稀鸟类的种群繁殖造成了伤害，提出了与题干间接有关的不利因素，使其无法达到support的效果，所以削弱了题目论点。
C.Since rice is not raised in midland province, few species of birds native to the province normally eat rice.
本选项说本地的鸟不怎么会吃米，属于前面所述的无关信息，故而排除
D.Without the permit, any farmers shown to have set out poison for the blackbirds would be heavily fined
本选项说不经许可放毒的农民会被重罚，同上，属于无关信息
E.The poison that farmers got approval to use has no taste or smell that would make it detectable by birds.
说农民放的毒米没有特殊的气味和味道，鸟分辨不出来，没有体现出对珍稀鸟类没有威胁，可能会造成伤害。这个选项我觉得是上述有因无果(weaken正确答案的否定果类型，无法达到预期的结果，无法support)和(不利因素：提出与题干间接有关的不利因素，使其无法达到support的效果)的综合，削弱了结论。
