prep-2-146 感觉比较对象不对称阿？

146.  (32521-!-item-!-188;#058&007141)

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

正确答案是A

这里用numbers 和 when对比，不对称阿？

难道是 now 和when 对比？

请教！

MM，可能意思是没有理解对》

这里比较的是状语，是now和when的时间段表示。。

就是现在的人数比当xxxx的时候的人数比较。。

谢谢你的回复！

但我怎样区别 状语比较 和 其他的比较呢？比如这道题，我先入为主的就认为是numbers 和其余的比较。

这道题还有一个疑问是：its numbers, 为什么number用了复数呢？ the number of sth 是单数阿？

up.

同问.我也不理解为什么numbers用复数