Statistics over four consecutive years showed that four percent more automobile accidents happened in California during the week following the switch to daylight saving time and during the weekfollowing the switch back to standard time than occurred the week before each event. These statistics show that these time changes adversely affect the alertness of California drivers.
The conclusion in the argument above is based on which of the following assumptions?
(A) Drivers in California as well as those in the rest of the United States have similar driving patterns.(B) The observed increases in accident rates are due almost entirely to an increase in the number of minor accidents. (C) Four years is not a sufficiently long period of time over which to judge the phenomenon described. (D) There are no other factors such as school vacations or holiday celebrations that cause accident rates to rise during these weeks. (E) A time change at any other time of year would not produce a similar increase in accident
答案是D，我不太懂E选项。
| 
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2013-5-18 12:43:47
收藏
收藏
楼主
~~~~~~~