请假og-116，多谢！

sunshining

116. Laws requiring the use of headlights during daylight hours can prevent automobile collisions. However,
since daylight visibility is worse in countries farther from the equator, any such laws would obvisouly be more
effective in preventing collisions in those countries. In fact, the only countries that actually have such laws are
farther from the equator than is the continental United States.
Which of the following conclusions could be most properly drawn from the information given above?
(A) Drivers in the continental United States who used their headlines during the day would be just as likely to
become involved in a collision as would drivers who did not use their headlights.
(B) In many countries that are farther from the equator than is the continental United States poor daylight
visilibty is the single most important factor in automobile collisions.
(C) The proportion of automobile collisions that occur in the daytime is greater in the continental United States
than in the countries that have daytime headlight laws.
(D) Fewer automobile collisions probably occur each year in countries that have daytime headlight laws than
occur within the continental United States.
(E) Daytime headlight laws would probably do less to prevent automobile collisions in the continental United
States than they do in the countries that have the laws.(E)

D为什么不对？不是说越远离赤道能见度越低的国家里面，这种法律对于防止车祸越有效吗？(since daylight visibility is worse in countries farther from the equator, any such laws would obvisouly be more
effective in preventing collisions in those countries)，那么施行法律的都是比美洲要远离赤道的国家，所以它们的汽车碰撞事故要少？

为什么不对呢？

liu_9000

楼主理解题意不对。

有效率跟数量多少不同。例如：越远离赤道能见度越低的国家里面，本来发生１０００件，有了该法后，只发生了６００件，减少了４０％。美洲本来发生５００件，有了改法后，只发生了４００件，效率２０％。在这种情况下Ｄ项是不成立的。

sunshining

解释的真清楚，多谢了。

呵呵，我发现好多我的错题都是因为理解的不对，不知道是不是受思维定势的影像。

我记得考gre的时候最好的部分就是逻辑了，还是陈向东老师教的课。