| 14. A recent survey of all auto accident victims in Dole County found that, of the severely injured drivers and front-seat passengers, 80 percent were not wearing seat belts at the time of their accidents. This indicates that, by wearing seat belts, drivers and front-seat passengers can greatly reduce their risk of being severely injured if they are in an auto accident.
一个对D镇汽车事故幸存者调查的报告发现，在司机和前排乘客严重受伤的事故中80%的人在意外发生是没有带安全带。这表明，司机和前排乘客携带安全带能够很大程度上降低他们在汽车事故中受重伤的风险。
The conclusion above is not properly drawn unless which of the following is true?
(A) Of all the drivers and front-seat passengers in the survey, more than 20 percent were wearing seat belts at the time of their accidents.
在这次调查中，超过20%的司机和前排乘客在事故发生时佩戴了安全带。
(B) Considerably more than 20 percent of drivers and front-seat passengers in Dole County always wear seat belts when traveling by car.
(C) More drivers and front-seat passengers in the survey than rear-seat passengers were very severely injured.
(D) More than half of the drivers and front-seat passengers in the survey were not wearing seat belts at the time of their accidents.
(E) Most of the auto accidents reported to police in Dole County do not involve any serious injury.
答案是A? 偶对A取非咋得不到结论不成立呢？ | 
