TPO 8的一个阅读。。求助

shamrock_hkUID: 2933561

Paragraph 4 Dissatisfaction with conventional explanations for dinosaur extinctions led to a surprising observation that, in turn, has suggested a new hypothesis. Many plants and animals disappear abruptly from the fossil record as one moves from layers of rock documenting the end of the Cretaceous up into rocks representing the beginning of the Cenozoic (the era after the Mesozoic). Between the last layer of Cretaceous rock and the first layer of Cenozoic rock, there is often a thin layer of clay. Scientists felt that they could get an idea of how long the extinctions took by determining how long it took to deposit this one centimeter of clay and they thought they could determine the time it took to deposit the clay by determining the amount of the element iridium (lr) it contained.
8. In paragraph 4, all the following questions are answered EXCEPT:
○Why is there a layer of clay between the rocks of the Cretaceous and Cenozoic?

○Why were scientists interested in determining how long it took to deposit the layer of clay at the end of the Cretaceous?


○What was the effect of the surprising observation scientists made?


○Why did scientists want more information about the dinosaur extinctions at the end of the Cretaceous?
我知道第一个确实没回答，2&3都答了。但是4由那一句answer了？ 还是就是感觉？

dkflameUID: 2680233

选项4来自这句：Scientists felt that they could get an idea of how long the extinctions took by determining how long it took to deposit this one centimeter of clay and they thought they could determine the time it took to deposit the clay by determining the amount of the element iridium (lr) it contained.

153954837@qq.coUID: 2989117

我觉得第一句话就能表达了
Dissatisfaction with conventional explanations for dinosaur extinctions

最后scientists那段的重点是
determining how long it took to deposit this one centimeter of clay
determining the amount of the element iridium (lr) it contained.
因为科学家想要
get an idea of how long the extinctions took
determine the time it took to deposit the clay
所以跟题目Why did scientists want more information about the dinosaur extinctions at the end of the Cretaceous? 【more information 】没太大关系的感觉~

菜鸟一只，个人意见，互相帮助，批评指正^^

miismeUID: 3369445

153954837@qq.co 发表于 2011-1-12 12:39
我觉得第一句话就能表达了
Dissatisfaction with conventional explanations for dinosaur extinctions

...

我同意你 我也选了D 答案太牵强了