题目内容双击单词支持查询和收藏哦～
收藏
纠错
题目材料：
Authorities in California required drivers to use headlights on a certain road during daytime as well as at night and found that annual accident rates on the road fell 15 percent from the previous level. The previous level had been well below the average for the state, and since accident rates that are already low are hard to reduce further, applying the daytime rule statewide would lead to a reduction of better than 15 percent.
The argument assumes which of the following?
-
A.Compliance with the daytime rule on the test road was at or close to 100 percent during the test period.
-
B.The test road was not selected because of a comparatively high incidence of the sort of accidents that daytime headlights could rationally be expected to help prevent.
-
C.Reducing the overall accident rate in California by more than 15 percent would allow law-enforcement personnel to be concentrated on roads where the accident rate is higher than the state average.
-
D.The reason that the accident rate on the test road had been below the state average prior to the test period was not that the road was designed to exceed current standards for highway design.
-
E.The test road had been constructed without regard to avoiding nighttime headlight glare from oncoming traffic.
B显示答案
