t-4-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 99percent 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.

the answer is e , i am wondering why not a ?

感觉E里面99percent have..有点怪...

时态也奇怪,我当时把have appear的都排除了.完成时不是应该是延续到现在吗.99%都灭绝了..还怎么延续到现在.

后面have vanished到是可以,可以理解为到现在已经消失了.

[請幫忙]請問一下為什麼不能選B?

此外，E選項的時態 "have appeared" 用過去是是否較好?

Of the five hundred.......that "have appeared" on Earth, nearly 99 percent have vanished.

麻煩了，謝謝

A的问题在于，前后是两句句子，中间没有连接词，因为这个原因所以D也同样错

B,我的感觉就是主语和谓语隔的太远了

不过我也觉得E改成过去时更好一点，望nn来指点，谢谢！！

 E 正确。B的错误是99 percent 前面没有“the",因为文中是特指，所以错。另外，E中“have appreared"和”have vanished" 对称，比B中一个“appeared" 一个“have vanished"好。

为什么我看到的参考答案是b!!!!

提起来，再请牛人指点一下啊，我看到的参考答案也是B

个人觉得E也不错，但不知选哪个更好一些

不提同意这位同学有关A的看法，nearly 99 percent of them vanishing.这不是一个句子，所以我认为A的问题还是them指代不清。

另外，关于时态的问题，有关于完成时和过去时的区别。用一般过去时的时候一定要有明确的时间标志词，比如in1980,last year,originally, 3days ago,而现在完成时，表示一个动作发生在过去，但是延续至今或者强调对现在的影响。所以看这句话的意思，应该用完成时比较好。Five hundred million different species of living creatures have appeared on Earth，这50亿生物种类虽然有99%都消失了，但是还是有延续至今的。所以完成时比较好。还请NN指教！

这道题A/C/D明显是有问题的，就请大家不要讨论了。关键是在B和E中，你要选哪个？给出理由好吧。

我选E是因为它读起来意思很明确，也就是逻辑关系清晰，B就显得繁杂，而且动词跳跃跨度太大，不太符合常规。

有关特指和泛指，原题干没有the的，E多了the，这是我怀疑的一个地方，好像不能随意添加定冠词的。