Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing.
A Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing.
B Nearly 99 percent of five hundred million different species of living creatures that appeared on Earth have vanished.
C Vanished are nearly 99percent of the five hundred million different species of living creatures that appeared on Earth.
D Of five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent of them havevanished.
E Of the five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent have vanished.
选择e
除了b头重脚轻，别的的问题我都不是很明确啊
觉得这类题都好模糊
A 缺少连词
B of 后面要有the 因为是特指
C are vanished 错 vanish是不及物动词 不存在被动语态
D 少定冠词the
本题的5个选项中仅有D选项的of them和前面的of重复，排除D，
然后C选项的vanished使用不对，这里vanish是一个不及物动词，不可能这么使用
剩下的3个选项严格上说都没有突出的语法错误，所以只能依靠逻辑意思加以判断
A选项的意思是：迄今为止有5亿个不同的生物物种曾经出现在地球上，大约99%都灭绝了。注意这里的灭绝处于一般独立主格位置，与文章形成松散逻辑关系，即，文章的主要意思是就是5亿个物种在地球上出现过
B选项的意思是那些曾经出现在地球上的5亿不同生物中的大约99%都已经灭绝了
E选项的意思是：在迄今为止出现在地球上的5亿个不同的物种中，99%都已经灭绝了，这里灭绝处于谓语，为主要强调对象。
能够看出，文章主要强调的实际上是99%灭绝的这个意思，所以BE的意思表达一定比A要好。
另外文章强调的应该是那些迄今为止出现过的物种，所以这里apprear应该使用完成时而不是一般过去时态，从这个角度看E比BC好；在这C用了倒装，但是这里没有采用倒装的必要，所以EB也比C好，最后E选项将of定语提前，平衡了句子的结构，使得文章的主语部分不显得太冗余，所以E是最佳答案
E为最后答案
Hope it helps
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