【每日逻辑练习第二季【2-3】

winghyy

精炼题
54s-strengthen EXCEPT
A population are declining in numbers. The ozone layer has been depleted and the ozone blocks UVB. Because A lacks hair, hide or feathers to shield UVB. So the primary cause of the declining amphibian population
is the depletion of the ozone layer.
选D  【正确答案A】
(A) Of the various types of radiation blocked by atmospheric ozone, UV-B is the only type that can damage genes.  
——strengthen [结论涉及的两个元素是 the ozone depletion和the amphibian population decline，与UVB无关]
(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.  ————strengthen
(C) Atmospheric ozone has been significantly depleted above all the areas of the world in
which amphibian populations are declining. ——strengthen
(D) The natural habitat of amphibians has not become smaller over the past century. ——irrelevant
(E) Amphibian populations have declined continuously for the last 50 years.——strengthen


Answer choice (A): This is the correct answer. The answer fails to shed any
light—positive or negative—on the connection between the ozone depletion
and the amphibian population decline. Because the argument is concerned with
the damage done by UV-B radiation, the fact that UV-B is the only damaging
type of radiation blocked by ozone is irrelevant.

Answer choice (D): This was the answer most frequently chosen by test takers.
This answer choice strengthens the argument by eliminating an alternate cause
for the effect (Type A). Had the natural habitat become smaller over the years
(from say, human encroachment or climatic change) then that shrinkage would
have offered an alternate explanation for the decline in the amphibian
population. By eliminating the possibility of habitat shrinkage, the stated cause
in the argument is strengthened.

winghyy

逻辑链
17. 50s-weaken
Many customers come to watch the celebrities, and they would prefer tall tables for a better view of the celebrities.  Moreover, diners seated on stools typically do not stay as long as diners seated at standard-height tables.  Therefore, if the Hollywood replaced some of its seating with high tables and stools, its profits would increase.
Prephase: In order to watch celebirites, they will spend less.
选D

18. The C telecommunication company plans to introduce celluar telephone service to isolate costal areas. This plan requires a big investiment.  The small-scale coffee farming is the only major economic acitivities. The coffee farmers can not offer the charge. Nevertheless, Calex contends that making the service available to these farmers will be profitable.
选A

19. 52s-assumption
Last year, with a record number of new companies starting up and with previously establised companies adding many jobs, a record number of new jobs created last year.
Establised companies will not add as many new jobs this year as last year. Therefore, unless a record number of companies start up this year, it will not break its record for the new jobs created.
选B

20. 53s-bold face
P insurance company cannot afford the payout. Because P cannot reduce the number of car-theft policies it carries, it cannot protect itself against continued large patyout. P has decided to offer a discount to holders of car-theft policies whose cars have antitheft devices. The amount of discount will cover the cost of installation within 2 years. Therefore, because cars with antitheft devices are rarely stolen, P's plan is likely to reduce its annual payout.
Prephase: 1st premise   2st Conculusion
选E

今天错得有点夸张了。。。