小蓝一道逻辑题

tianlingfrl · 发表于 2010-7-29 10:44:26

39.A recent survey of all auto accident vicitims in Dole Country 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.
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.
正确答案就是A 谁能帮我解释下里面的逻辑关系啊~还有就是第一个句号前面那句话的翻译，是说严重受伤的人里有有80%没有系安全带么？

小蓝一道逻辑题

所属分类: GMAT考试

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