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(A) The 1987 air pollution control measures enacted in Los Diablos were put into effect in November of 1988.(所以1989年的污染大大减少) (B) In December of 1988 a new and far more accurate gas spectrometer was invented.(所以1989年监测到的污染应该比以前更准确,故应上升而非下降,这就是答案啦!) (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.(因为修订了,所以1989年应与以前年度不同) (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.(市长受贿了,exempt了一些企业,所以导致1989年的数字下降) (E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area.(具体环保措施最少要两年才能降低空气中过量的一氧化碳和臭氧,所以1987年实施,到1989年才见效。) |