根据材料，回答试题：
　　A recent study, published in last week' s Journal of the American Medical Association, offers a picture of how risky it is to get a lift from a teenage driver. Indeed, a 16-year-old driver with three or more passengers is three times as likely to have a fatal accident as a teenager driving alone. By contrast, the risk of death for drivers between 30 and 59 decreases with each additional passenger.
　　The author also found that the death rates for teenage drivers increased dramatically after 10 p.m., and especially after midnight, with passengers in the car, the driver was even more likely to die in a late-night accident.
　　Robert Foss, a scientist at the University of North Carolina Highway Safely Research Center, says the higher death rates for teenage drivers have less to do with "really stupid behavior" than with just a lack of driving experience. "The basic issue", he says, "is that adults who are responsible for issuing licenses fail to recognize how complex and skilled a task driving is."
　　Both he and the author of the study believe that the way to mitigate (使缓解) the problem is to have states institute so-called graduated licensing systems, in which getting a license is a multistage process. A graduated license requires that a teenager first prove himself capable of driving in the presence of an adult, followed by a period of driving with night of passenger restrictions, before graduating to full driving privileges.
　　Graduated licensing systems have reduced teenage driver crashes, according to recent studies. About half of the states now have some sort of graduated licensing system in place, but only 10 of those slates have restrictions on passengers. California is the strictest, with a novice (新手) driver prohibited from carrying any passenger under 20 (without the presence of an adult over 25 ) for the first six months.
　　第46题 Which of the following situations is most dangerous according to the passage?
　　A.Adults giving a lift to teenagers on the highway after 10 p. m.
　　B.A teenager driving after mid night with passengers in the car.
　　C.Adults driving with three or more teenage passengers at night.
　　D.A teenager getting a lift from a stranger on the highway at midnight.
　　答案：B
　　第47题 According to Robert Foss, the high death rate of teenage drivers is mainly due to__________
　　A.their frequent driving at night B.their improper way of driving
　　C.their lack of driving experience D.their driving with passengers
　　答案：C
　　第48题 According to Paragraph 3, which of the following statements is TRUE?
　　A.Teenagers should spend more time learning to drive.
　　B.Driving is a skill too complicated for teenagers to learn.
　　C.Restrictions should be imposed on teenagers applying to take driving lessons,
　　D.The licensing authorities are partly responsible for teenagers' driving accidents.
　　答案：D
　　第49题 A suggested measure to be taken to reduce teenagers' driving accidents is that__________
　　A.driving in the presence of an adult should be made a rule
　　B.they should be prohibited from taking on passengers
　　C.they should not be allowed to drive after 10 p. m.
　　D.the licensing system should be improved
　　答案：D
　　第50题 The present situation in about half of the states is that the graduated licensing system__________
　　A.is under discussion B.is about to be set up
　　C.has been put into effect D.has been perfected
　　答案：C

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