B. Nearly 99 percent of five hundred million different species of living creatures that appeared on Earth have vanished.
E. Of the five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent have vanished.
I choose E. Here “five hundred million different species” is a definite noun phrase, so article “the” must be used in front of it. Therefore B is out. In addition, “appeared” in B implies that all the species are all gone now, which is not true. So E is a better choice.
[此贴子已经被作者于2004-6-11 1:42:32编辑过] |