FEIFEI 60

lanyuqi

60. One of the more reliable methods of determining regional climatic conditions in prehistoric periods is to examine plant pollen trapped in glacial ice during ancient times. By comparing such pollen samples with spores take from modern vegetation, scientists can figure out approximately what the weather was like at the time of pollen deposition. Furthermore, by submitting the prehistoric samples to radiocarbon dating techniques, we can also determine when certain climatic conditions were prevalent in that portion of the globe.

 

Which one of the following may be inferred from the information in the passage?

 

A.       The earth has undergone several glacial periods.

B.        Radiocarbon dating can be corroborated by glacial evidence.

C.        Similarities between prehistoric and contemporary climates do not exist.

D.       Pollen deposition is a fairly continuous process.

E.        Certain flora are reliably associated with particular climatic conditions.

 

答案是E ， 可是我想不通啊，题中说是比较古时候的Pollen 和现在的spore  就可以得出what the weather was like at the time of pollen deposition .  我知道题目的意思可能是说有什么样的气候就会生长出什么样的flora，可是这是我们自己想的，如果检验的花粉是通过别的difference ,比如说是湿度啊等等的，不通的flora也可以有相同的湿度啊，那么断然的得出E的结论就不对了啊。

lanyuqi

lanyuqi

水色

请问D选项。FF135详解中提到“But the statement is not about the continuity of climatic conditions. So D is irrelevant”

可是如果对D取非，题中的结论也无法成立 （其思路与下选E思路一致。觉得如果E对，D也应该成立啊）

For Reference （From135 FF详解）

No. 60 is a good example. What the passage says is that scientists can figure out the weather condition in ancient times by examine the pollen from those times. So the hidden premise is that there is a connection between groups of plants and climatic conditions. If E is not true, and there is no connection between plants and climatic conditions, the statement that scientists can find out the climatic conditions by studying pollen can not hold.

So, for INFERENCE questions, you should treat it the same way as ASSUMTION question. First, understand the conclusion, or the statement in this question. And find the REQUIRED condition in the choices. To test the answer, use “NOT” and put it back in the argument to see if conclusion still holds.

[此贴子已经被作者于2007-9-20 19:03:31编辑过]

水色

ding

snoopydior

请问D选项。FF135详解中提到“But the statement is not about the continuity of climatic conditions. So D is irrelevant”

可是如果对D取非，题中的结论也无法成立 （其思路与下选E思路一致。觉得如果E对，D也应该成立啊）

我觉得Ｄ是削弱结论．

文章中说可以确定at the time of pollen deposition的气候，如果如Ｄ所说pollen deposition是个相当长的过程，岂不是没有可以确定的固定的时间点，那对应时间点的气候也无从谈起了呢？

（因为在长时间里气候可能变化吧）

不知道是否能够解决水色ＭＭ的问题呢？

southnorth

D不相关

何况现实中也不存在呀。花粉变成标本也不需要一个相当持续的过程。

elaine1031

up

DaisyGu

原文的含义是:因为新规定出台，所以才导致事故报告增加50%。
C的含义取非就是事故增加了50%，也就是说事故增加了50%才导致报告增加了50%，而不是因为新规定出台，这就使得原文的推理不成立了。