请教费费宝典TEST3 38，52--->beautywawa转移

emmahe

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 non-amphibian 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.

答案说选D，但我认为此答案排除了栖息地的他因，应是加强作用，A中的GENES和后面的论证没有太大的关系。答案到底该是什么？

52. Birds need so much food energy to maintain their body temperatures that some of them spend most of their time eating. But a comparison of a bird of a seed-eating species to a bird of a nectar-eating species that has the same overall energy requirement would surely show that the seed-eating bird spends more time eating than does the nectar-eating bird, since a given amount of nectar provides more energy than does the same amount of seeds

The argument relies on which one of the following questionable assumptions

(A) Birds of different species do not generally have the same overall energy requirements as each other

(B) The nectar-eating bird does not sometimes also eat seeds

(C) The time it takes for the nectar-eating bird to eat a given amount of nectar is not longer than the time it takes the seed-eating bird to eat the same amount of seeds

(D) The seed-eating bird does not have a lower body temperature than that of the nectar-eating bird

(E) The overall energy requirements of a given bird do not depend on factors such as the size of the bird, its nest-building habits; and the climate of the region in which it lives

该题的答案是否是最后一个？答案上没有明确给出。

robertchu

First, it's better to only ask one questin per post.

robertchu

Q38: A is the best answer.  See this: http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=69494

robertchu

Q52: C is the best answer.  

E is not relevant, because the passage talks about "comparison of a bird of a seed-eating species to a bird of a nectar-eating species that has the same overall energy requirement"

Since time spent eating depends on the amount to eat, and the eating speed.  Therefore C, addressing the eating speed factor, is an assumption needed by the original argument.

foreinter

请问B为什么不对

foreinter

再顶