[求助]费费逻辑38

dydingding

38. Amphibian populations are declining in numbers worldwide. Not coincidentally, the earth’s ozone layer has been continuously depleted throughout the last 50 years. Atmospheric ozone blocks UV-B, a type of ultraviolet radiation that is continuously produced by the sun, and which can damage genes. Because amphibians lack hair, hide, or feathers to shield them, they are particularly vulnerable to UV-B radiation. In addition, their gelatinous eggs lack the protection of leathery or hard shells. Thus, the primary cause of the declining amphibian population is the depletion of the ozone layer.

Each of the following, if true, would strengthen the argument EXCEPT:

(A) Of the various types of radiation blocked by atmospheric ozone, UV-B is the only type that can damage genes.

(B) Amphibian populations are declining far more rapidly than are the populations of nonamphibian species whose tissues and eggs have more natural protection from UV-B.

(C) Atmospheric ozone has been significantly depleted above all the areas of the world in which amphibian populations are declining.

(D) The natural habitat of amphibians has not become smaller over the past century.

(E) Amphibian populations have declined continuously for the last 50 years.

请教D是怎样起到加强作用的?

weiyu

You might make a mistake when reading the question; Each of the following, if true, would strengthen the argument EXCEPT,

dydingding

答案给的是A,所以我问为什么D是加强,因为我选的D

eday

以前数量没变少，现在变少了，所以有可能是radiation 造成的，所以 加强．

isabellu

属于排除他因的加强类型

apanapan

和楼主的选择一样,我也是觉得该选D),正确答案的A),我觉得能起加强作用呵。UV-B is the only type that can damage genes. 但是这个唯一原因由于臭氧层的破坏而上升,造成Amphibian 数量下降,这不是加强吗?


4楼兄弟的解释:以前数量没变少，现在变少了，所以有可能是radiation 造成的，所以 加强．理解不了。以前数量没有变少,但是题目中没有说上个世纪的臭氧层没有遭到破坏呀。如果上个世纪的臭氧层没有遭到破坏数量却减少了,那不就是起到削弱作用了吗?


请教

bluedkny

    the argument is the primary cause of the declining amphibian population is the depletion of the ozone layer or not


for D, 大家解释的很清楚了。


From the question,


the earth’s ozone layer has been continuously depleted throughout the last 50 years. Atmospheric ozone blocks UV-B


Atmospheric ozone blocks UV-B, a type of ultraviolet radiation that is continuously produced by the sun, and which can damage genes


(B) Amphibian populations 下降快的多比nonamphbian populations, is caused by the depletion of the ozone layer.


(C) Atmospheric ozone has been significantly depleted above all the areas of the world in which amphibian populations are declining.     地域上也是一致的，所以加强。


A是怎么削弱的？


    


E是怎么加强的？E strengths the argement for the trend of the declining amphibian population is same as the trend of the depletion of the ozone layer in the last 50 years.