1.Blood banks will shortly start to screen all donors for NANB hepatitis.Although the new screening tests are estimated to disqualify up to 5 percent of all prospective blood donors,they'll still miss two-thirds of donors carrying NABA hepatitis.Therefor,about 10 percent of actual donors will still supply NANB contaminated blood > >The argument abouv depends on which of the following assumptions? > >A Donors carrying NABA hepatitis donn't in a large percentage of cases,carry other infectionos for which reliable screening tests are >routinely performed. > >B Donors carrying NABA hepatitis do not a large percentage of cases,develop the disease themselves at any point. > >C The estimate of the number of donors who would be disqualified by testests for NABA hepatitis in an undertimate. > >D The incidence of NABA hepatitis is lower among the potencial donors than it is in the population at large > >E The donors who will still supply NABA contaminated blood donate blood at the average frequency for all donors. > > 答案选A 解释一下吧 > >2.A recent survey of all auto accident victims in Dole Couty 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 saet belts,drivers and front-seat passengers can greatly reduce their risk of being severely injured if they are in an auto accidents. > >The conlusion above is not properly drawn unless which of the following is true? > >A Of all the drivers and front-seat passengers int 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 front-seat >passengers in the Dole County always wear seat belts when traveling by car > >C More drivers and front-saet 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 ro police in Dole County do not involve any serious injury > >答案是A 解释一下 >
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发表于 2007-7-16 12:35:00
