阅读理解

　　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 aged fifteen to twenty．Ryan's father, Thomas Didone, is a police captain in Montgomery County, Maryland．He said, "It was an inexperienced," immature driver who felt that he was invincible(不可战胜的), 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 upsetting experiences and tragedy for the rest of the community．"

　　Jim Jennings from the Allstate Insurance Company said "The number one cause of distracted-driving accidents is the mobile phone．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 man somebody who isn't．

　　Reaching for a cell phone when it's going off, you're nine times more likely to get into an accident than normally driving," The insurance industry recently held a safety event　near Washington for teen drivers．

　　At first, nineteen-year-old Kevin．Schumann easily avoided large, inflatable(充气的)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．

　　Debbie Pickford from the Allstate Insurance Company said, "Teens are especially at risk from distracted driving－and not just because they lack experience on the roads．What we know from research on teen brain, development, is mat teens don't