[問題]天山4-Q39

[FionaV]

請問...為什麼D不好呢?

[ivy]

個人認為是因為them指代不清
不知是species or creatures?
GWD很多題目x of x 後面的代名詞都指代不清
所以AD都錯囉!

[A級垂耳兔]

In the last several decades, scientists have questioned the role of extinction in evolution. Of the millions of species that have existed on this planet, more than 99 percent are extinct. Historically, biologists regarded extinction as a natural outcome of competition between newly evolved, adaptively superior species and their older, more primitive ancestors. Recently, however, paleontologists have discovered that many different, unrelated species living in large ecosystems tend to become extinct at nearly the same time. The cause is always some sort of climate change or catastrophic event that produces conditions too severe for most organisms to endure. Moreover, new species evolve after the wave of extinction removes many of the species that previously occupied a region for millions of years. Thus extinction does not result from evolution, but actually causes it.

google原句....對岸找的...
答案B違反由輕到重....不可能是正確答案~~~

[nomade]

我也認為是E
句意是從以前到現在出現過的物種，有99%都已經滅絕
所以appear 用完成式是可以的

不過the的討論到是讓我上了一課
平常做題目很少在注意定冠詞的部分
看來也該好好的注意這個考點

[chencraig0227]

小聲問一下! 請問(C)倒裝句哪裡有錯呢? 整個倒裝句構有問題嗎? 還是是時態問題??

[Huang Hsin-Yi]

小聲問一下! 請問(C)倒裝句哪裡有錯呢? 整個倒裝句構有問題嗎? 還是是時態問題??

where is subject?

[chencraig0227]

C. Vanished are nearly 99 percent of the five hundred million different species of living creatures that appeared on Earth.

反藍的部份整個是主詞
因為主詞太長 所以要倒裝 不然頭重腳輕!
這是我認為文法沒有錯誤!(歡迎討論)

另外 我看不太出有太大的線索可以決定時態...
所以BCE我覺得都很好! 哈哈!

[mediayouth]

下面是截自一位STAFF from Manhattan GMAT Prep Forum 所說的:

"B has a verb tense issue. It says "species that appeared" on earth. Appeared is simple past but, in this case, we want present perfect. We use past tense to discuss something that is completely over; we use present perfect to discuss something that started in the past but is either still true or still going on in the present. It is still true that the species appeared, so we want to say "have appeared" - which answer E does use and answer B does not."

所以 E 用完成式是合理的!!

[Huang Hsin-Yi]

I think that is the point! Thank you for sharing!