求助 OG12-70/大全764

Nothuman

764.    The gyrfalcon, an Arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970’s.
(A) extinction; its numbers are now five times greater than
(B) extinction; its numbers are now five times more than
(C) extinction, their numbers now fivefold what they were
(D) extinction, now with fivefold the numbers they had
(E) extinction, now with numbers five times greater than

这道题选E 是没什么问题，但是里面有两个点：
1、 numbers这里面怎么理解啊？ 应该单数才合理吧
2.、题干里面 an Arctic bird of prey应给怎么翻译呢？ 是一种被捕食的北极鸟还是一种捕食性北极鸟呢？

谢谢！

Nothuman

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