大全-C-16 有个知识盲点，希望大家指点

allen0018

    

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.

    

 

    

86年立的法，88年才实施，说明中间两年不减少，89年减少

    

(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.（B）

    

(E) Excess
ozone and carbon monoxide require a minimum of two years to break down naturally
in the atmosphere above a given area.

A 里面的ENACT 不是就是实施的意思马？？？

这没有反对前提马？？？ 原文说法律一早就实施了啊

谢谢

caterpillarcn

这里有个gap，enact不等于put into effect， 立法通过是通过了，但不是说通过了就马上生效的啊。例如说，今天咱国家通过提高最低薪水的立法，从明年1月1号开始实施是一个道理。