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上了年纪了，只记得最后一道了，是个全划线
Five million species have existed on earth（大概是这么写的）, 99 percent of them have vanished。
A
B 99 percent of five million .....that have existed on earth have vanished.
C Of five million........that have existed on earth, 99 percent of them have vanished.
D Of five million .......that have existed on earth, 99 percent have vanished.
E Of the five million..that have existed on earth., 99 percent have vanished.
我选的E,不知对不对，请大家讨论。
考后感想：
total: 7**
曾经ets难为水，除却CD不是云 | 
