OG 251 急问

jennifer2003

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
A这里为什么要用numbers,而不用number,这种情况好像不多见啊！如果有一个选项用了单数，那我肯定要错了

[此贴子已经被作者于2003-12-14 23:24:05编辑过]

深海的小美人鱼

numbers在这里做数目，数量讲。你可以说number也可以说numbers.