20．Car crashes are the top killer of American teenagers．Most of the crashes result from distracted driving-not paying attention to the road．
Ryan Didone was a fifteen-year-old passenger in a car that hit a tree．He was one of the nation's more than thirty thousand victims of traffic crashes in 2008．Nearly four thousand deaths，about twelve percent involved drivers age fifteen to twenty．
Ryan's father，Thomas Didone，is a police captain in Maryland．"It was an inexperienced，immature driver driving at night with a carload of kids．He was distracted，he was going too fast，and it ended up causing one death and some seriously injured．"He shares the story of his son's death to help educate teens and their families about distracted driving．
Jim Jennings from the Allstate Insurance Company says the number one cause of distracted-driving accidents is the mobile phone．He says talking on the phone or reaching for it is like drinking four beers and driving．"If you're texting while driving，you are twenty-three times more likely to get into an accident than somebody who isn't．"
Government and private groups are using public service announcements and events to bring more attention to the problem．For example，the insurance industry recently held a safety event for teen drivers．At first，nineteen-year-old Kevin Schumann easily avoided large，inflatable dolls thrown in front of the car to represent children．He also avoided orange cones representing the edge of the road．Then，as part of the test，he started texting．He hit several cones and at least one doll．"That's what really opened up the experience for me to prove how bad it is to really text and drive．"
Debbie Pickford of Allstate Insurance says teens are especially at risk from distracted driving-and not just because they lack experience on the roads．"According to the research，teens don't really have fully developed brains until they're twenty-five years old．You put those two things together and you get a much，much higher risk．"
A new law proposes a graduated driver licensing system．Graduated means teenagers start with restrictions like on night driving and numbers of passengers．They could not get a full driver's license until age eighteen．
45．Of all the following，which is the best title for the passage？C
A．Car Crashes-the Top Killer B．Drunken Driving
C．Distracted Driving D．How to Avoid Car Crashes
46．According to Jim Jennings，what might be the main cause of distracted driving accidents？
A．Speed．B．Age．C．Experience．D．Cell-phones．
47．Which of the following statements is true？C
A．Thomas Didone is responsible for his son Ryan's death．
B．The insurance companies benefit a lot from teen driving．
C．Kevin Schumann took the test to learn the risk of texting while driving．
D．Debbie Pickford thinks that people cannot drive until brains are fully developed．
48．According to the new law，A．
A．it will be harder for young people to get a full driver's license
B．people will not be allowed to touch the wheel until they are 18
C．young people are forbidden to take any passengers in their cars
D．people can't drive until they graduate from colleges or universities．
分析 在美国车祸是青少年的头号杀手，而且大多数的车祸都是由于开车时分心，没有留意路况造成的．在本文中作者通过讲述Ryan Didone的死亡以及保险公司所做的实验说明了开车时打手机或发短信是造成车祸的主要原因，人们应该对此高度注意．
解答 45．C主旨大意题．本文讲述了绝大多数青少年所遭遇的车祸都是由于开车时打手机，发短信造成的．并且对此进行了详细的介绍，由此判断作者的目的是要提醒人们避免开车时候分神，故C选项内容更能够反应文章中心，答案选C．
46．D细节理解题．根据文章第三段可知手机是造成分心的头号原因，再由后文中的If you're texting while driving，you are twenty-three times more likely to get into an accident than somebody who isn't可知在四个选项中手机是最可能导致交通意外的，故答案选D．
47．C推理判断题．作者在文章倒数二、三段介绍了保险公司对Kevin Schumann 所做的安全测试，证明了开车时候用手机的危害，注意力不集中，分心驾驶会带来风险，故答案选C．
48．A细节理解题．根据最后一段A new law proposes a graduated driver licensing system．Graduated means teenagers start with restrictions like on night driving and numbers of passengers．They could not get a full driver's license until age eighteen．一个新的法律提出了一个毕业司机执照制度．毕业意味着青少年开始限制，如夜间驾驶和禁带许多乘客．他们直到十八岁才能拿到驾驶执照．所以说对于青少年来说，想拿到驾照会更难．故选A
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