GWD15 V39求教

Q39:

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.