这道题弄不懂

Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing.

1. Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing.
2. Nearly 99 percent of five hundred million different species of living creatures that appeared on Earth have vanished.
3. Vanished are nearly 99 percent of the five hundred million different species of living creatures that appeared on Earth.
4. Of five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent of them have vanished.
5. Of the five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent have vanished.

答案是E，怎么感觉B也不错呢

请问本题题号是什么？

B中500M species前缺少the，使得暗含了“世界上一共不止500M种species”的意思，而原句表达的意思是“世界上一共有500M种”，所以意思不对。

过去时表示动作发生在过去，并且已经完成，B中用appeared表示现在全都灭绝了，时态不对。

B和E都用了have vanished，表示灭绝的动作从以前到现在的一段时间都没完成，还在进行中，这时appear用与其平行的时态have appeared不会错。