请问逻辑大全-C-16

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.

正确答案是(B)

是否因为新发明的gas spectrometer应该使1988和1989年的pollution levels都下降?

另外,答案选项(D)似乎也可以是答案

因为(D)所描述的"污染免列"是发生在1988年

如同正确选项(B)

(D)也无法解释为何1988年pollution levels没有下降,不是吗?

请板上前辈给予一些指点

谢谢!

No answer for this question, Let me bring it up again.

No idea for this, what is the type of this sort of question.

市长都接受了污染工厂的大笔贿赂金钱；污染标准的法例会改变了。兩者有直接關係嗎

B - In December of 1988 a new and far more accurate gas spectrometer was invented. But it might not be in use!!!

D - The mayor accept money not necessarily result in loosen air pollution control measure, but answer D already point out mayor got the money AND exempted those industries from mearure.

个人想法：

D至少可以说明88年的增加原因 - 由于丑闻。

而B的内容不能解释任何一年，所以说是LEAST选项。

C：89年初修改了标准，可能是导致89年降低的原因。

D：市长接受了污染工厂的贿赂金钱，准许那些工厂不采取控制手段，当然88年的污染就上升了。

B：88年底发明了更精确的测量仪器，那89年的数字应该上升啊。这整个就是削弱了，所以选B。