- UID
- 11595
- 在线时间
- 小时
- 注册时间
- 2003-9-20
- 最后登录
- 1970-1-1
- 主题
- 帖子
- 性别
- 保密
|
犯迷糊：大全-C-16
GMAT LSATCR-GMAT-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.
不是很明白：越看越觉得答案是D，其后果应该导致LD城1989年的污染更严重，从而不能解释污染下降。
答案却是B，一种新的检测仪器的发明。难道新的仪器获得的结果不能和以前的数据形成差异？
头晕呀。
哪位NN解释以下？
WYKS
|
|
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2003-11-20 16:15:00
