一道逻辑题~很疑惑很困混~

yaoxiayi · 发表于 2010-5-23 12:13:56

In 1986, the city of Los Diablos had 20 days on which air pollution reached unhealthful amounts and a smog alert was put into effect. In early 1987, new air pollution control measures were enacted, but the city had smog alerts on 31 days that year and on 39 days the following year. In 1989, however, the number of smog alerts in Los Diablos dropped to sixteen. The main air pollutants in Los Diablos are ozone and carbon monoxide, and since 1986 the levels of both have been monitored by gas spectrography.
Which of the following statements, assuming that each is true, would be LEAST helpful in explaining the air pollution levels in Los Diablos between 1986 and 1989?
(A) The 1987 air pollution control measures enacted in Los Diablos were put into effect in November of 1988.
(B) In December of 1988 a new and far more accurate gas spectrometer was invented.
(C) In February of 1989, the Pollution Control Board of Los Diablos revised the scale used to determine the amount of air pollution considered unhealthful.
(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.
(E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area.

答案选B，我觉得应该是D啊？？

mousealpha · 发表于 2010-5-23 12:49:15

我觉得。。

d说市长接受捐款并免除企业的pollution control measures。。这能支持原文的87-88年smog alert增长。。也跟原文说的新污染control measures对应。。

b虽说可以得出smog alert的次数是由于探测精度问题引起。。但我觉得跟文中说的control measure没有关系了。。

相比之下d比b支持的更全面一些。。所以least helpful的是b。。

楼下继续。。

yaoxiayi · 发表于 2010-5-23 14:34:12

88年免除工厂的控制，不是应该相反会增大污染吗？怎么会有89年的降低呢？我疑惑啊~~

一道逻辑题~很疑惑很困混~

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