After googling the phrase, I find in many newspapers that refer it as a specie of bird that is rare and migratory. Please find the one of the links below. So, according to this explanation, I've no doubt that choise A should be the best answer.
Large flocks of rare migratory birds from north China and Siberia have been arriving at Poyang Lake in east China's Jiangxi Province this week to spend the winter.
Sources with the state-level Poyang Lake Nature Reserve said the number of birds is increasing rapidly.
According to the sources, these birds include white cranes, grey cranes, swans and many other rare species ......
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.
在A与B之间痛苦抉择了半天，根据题目说的given the concern voiced by some residents,意思是也该考虑一些居民的感受，而这些居民认为毒米会对稀有鸟类构成威胁，A中说候鸟是春天第一批来的鸟，所以毒米会被他们吃掉从而不会对稀有鸟类构成威胁，所以the wildlife agency approved the permits.而B考虑的是farmer的感受，而不是居民的感受，所以还得先看清题意才是最重要的！妈妈呀，真要命。。。
其他论坛的解释 A strengthener with a twist: we have to take an objection into account.
Our prediction: an answer that suggests that the rare species will NOT be harmed by the poison.
Only (a) gives us any reason to believe that the poison will keep the blackbirds under control but won't hurt other species. If the blackbirds get there first, then we postulate that either:
- the blackbirds eat all the poisoned rice, so other birds aren't affected; or
- once the blackbirds are gone, the farmers can remove the poisoned rice, so other birds aren't affected.
Remember: "strengthen" is NOT synonomous with "prove". (a) certainly doesn't prove that other birds won't be affected, but it gives us a reason to believe that they won't be.
(b) through (e) don't distinguish between blackbirds and other birds, so they're all outside the scope. _________________
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发表于 2008-6-15 15:47:00
