A recent survey of all auto accident victims in doile 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 severly 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. (B) considerably more than 20 percent of drivers and fornt-seat passengers in dole County always wear seat belts when traveling by car. (C) More drivers and front-seat passengers than rear-seat passagers were very serverly injured. (D) More than half of the drivers and front-seat passangers 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 serioius injury.
答案是a,死活不明白。a中的20%指的是: 系带的人比上所有的司机和坐在前排的乘客
而文中80%指的是:没系带的人比上受伤的司机和乘客
如果按照a中所说,调查所有的司机和乘客,有超过20%的人系有安全带,那么没系安全带的人就少于80%,那么这对文章怎么起加强作用。望指点,谢谢!
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