GWD32 32-34 终结版（TN答案有错）

Allenisland

谢楼主！我做的时候感觉bbe不可能有错的对答案桑心死了

shinesalvation

呃呃，对的对的~BBE+1~~~

酸枣

长舒一口气啊哈哈哈

gillianjiaomx

就是，看到题瞬间哭了~怎么也想不明白！

jay871750293

同意BBE~
以下是我的分析：
Q32
The dry mountain ranges of the western United States contain rocks dating back 440 to 510 million years, to the Ordovician period, and teeming with evidence of tropical marine life. (第一句通过介绍rocks来引出本文主题---radiation，接下来则开始介绍radiation的意义、定义、简要内容)This rock record provides clues about one of the most significant radiations（radiation的意义或重要性） (periods when existing life-forms gave rise to variations that would eventually evolve into entirely new species（radiation的定义）) in the history of marine invertebrates. During this radiation the number of marine biological families increased greatly, and these families included species that would dominate the marine ecosystems of the area for the next 215 million years.
（radiation的简要内容）

以上为文章第一部分，主要介绍与描述了radiation；
接下来是第二部分，讲述radiation成因~

Although the radiation spanned tens of millions of years, major changes in many species occurred during a geologically short time span within the radiation and, furthermore, appear to have occurred worldwide, suggesting that external events were major factors in the radiation.(这句话引出外部原因是形成radiation的主要因素，然后接下来进行详细解释) And, in fact, there is evidence of major ecological and geological changes during this period: the sea level dropped drastically and mountain ranges were formed, in this instance, rather than leading to large-scale extinctions, these kinds of environmental changes may have resulted in an enriched pattern of habitats and nutrients, which in turn gave rise to the Ordovician radiation. However, the actual relationship between these environmental factors and the diversification of life forms is not yet fully understood

将文章分为以上两部分之后，大家应该可以比较清晰的看出来B是正确的了吧~

Q33
我认为B比E好的另一个地方在于用了may，表示可能与推测，并不绝对，而E的话则反之~

爬完从08年到13年的所有楼，这种大家相互讨论的感觉真好~~~
谢谢所有的前辈们~~

cysteresa

C explaining the mechanisms through which marine life-forms evolved during a particular period错我认为还有一点，文中说的是marine invertebrates，而答案marine life-forms明显扩大了范围

cysteresa

Which of the following can be inferred from the passage regarding the geologic changes that occurred during Ordovician period?
B.        They may have created conditions favorable to the evolution of many new life-forms
C.        They may have caused the extinction of many of the marine species living in shallow waters
这个虽然我也选的B，但是对于C，我有个想法，B是文章中明确说了，不算infer，但是文中"rather than leading to large-scale extinctions"暗示说这种生态和地理变化也可能导致extinction，答案的may have done暗示的一种不太可能发生的情况，这样一想，我又觉得C有合理性

452272330

妈蛋的，害得我把全文一字一句地翻译出来，因为不相信自己错这么多，然后一个字一个字地去找原文，发现根本找不到答案，竟然都开始质疑自己的智商和理解能力了。

冰宝宝

亲们！！！真的是BBE吗？？？我也是这个答案！！！但是我觉得第一道的C其实也有道理哎~

imsy51

BBE +1 ！！！！！！！！
第一题如果选c的话，那个mechanisms原文中没有对应啊，最后一段说了actual relationship between these environmental factors and the diversification of life forms not fully understood, 那么这个mechanism就更是无从说起了。