请假GWD-22 第一篇阅读前两题，百思不得其解，望指点

wildbean

Q4~Q6: GWD32—32-34

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. This rock record provides clues about one of the most significant radiations (periods when existing life-forms gave rise to variations that would eventually evolve into entirely new species) 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. 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. 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 pattem 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


Q4: The passage is primarily concerned with

A.evaluating the evidence of a major geologic period and determining its duration

B.describing an evolutionary phenomenon and speculating about its cause

C.explaining the mechanisms through which marine life-forms evolved during a particular period

D.analyzing the impact on later life-forms of an important evolutionary development

E.contrasting a period of evolutionary change with other such periods

---------------------------------------------------------------
LZ选的是B, 答案是C


Q5. Which of the following can be inferred from the passage regarding the geologic changes that occurred during Ordovician period?

A.They were more drastic than those associated with other radiations

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

D.They may have been a factor in the development of new species adapted to living both on land and in water

E.They hastened the formation of the extensive dry regions found in the western united states

----------------------------------------------------------------
LZ选的是B, 答案是E




Q4: The passage is primarily concerned with

A.evaluating the evidence of a major geologic period and determining its duration

B.describing an evolutionary phenomenon and speculating about its cause

C.explaining the mechanisms through which marine life-forms evolved during a particular period

D.analyzing the impact on later life-forms of an important evolutionary development

E.contrasting a period of evolutionary change with other such periods

---------------------------------------------------------------
LZ选的是B, 答案是C


Q5. Which of the following can be inferred from the passage regarding the geologic changes that occurred during Ordovician period?

A.They were more drastic than those associated with other radiations

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

D.They may have been a factor in the development of new species adapted to living both on land and in water

E.They hastened the formation of the extensive dry regions found in the western united states

----------------------------------------------------------------
LZ选的是B, 答案是E




望大家指点，感激不尽啦

wildbean

sorry不小心弄重复的，前两道

葡萄园的拉果果

我是这么想的，第二题是问geologic changes，所以楼主选b与这个geologic change不搭吧！

葡萄园的拉果果

楼主可以看文中倒数第三行，有关键词出现的。

wildbean

嗯，谢谢
但是 证据出现的地方
"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 pattem of habitats and nutrients, which in turn gave rise to the Ordovician radiation."
不是和B选项"They may have created conditions favorable to the evolution of many new life-forms"相符吗？
答案E"They hastened the formation of the extensive dry regions found in the western united states"在文中也没有找到依据
糊涂了~~

葡萄园的拉果果

我觉得rather than leading to large-scale extinctions只是个插入语，these kinds of environment changes巴拉巴拉的其实是在修饰the sea level dropped drastically and mountain ranges were formed。

alexisqyj

偶也觉得答案有问题耶，而且和LZ选的都一样哦~鉴于木有可靠答案，相信自己吧~

yzcww

我也选的是这个~

birbird11

我也是

aileenhuang

我也跟LZ选得一样- -。