2．The main cause of death and disability in the US Stroke（中风）is the main cause of death and disability in the United States．Every 45seconds，someone in America has a stroke．（36）DIt is the nation's third leading cause of death，ranking behind diseases of the heart and all forms of cancer．The following is something more about stroke．
Definition and description of a stroke
Stroke is a type of cardiovascular disease．It affects the arteries（动脉） leading to and within the brain．A stroke occurs when a blood vessel（血管） that carries oxygen and nutrients to the brain is either blocked by a clot or bursts．（37）E．So stroke forms．
（38）A
The American Stroke Association has identified several factors （因素） that increase the risk of stroke．The more risk factors a person has，the greater the chance that he or she will have a stroke．Some of these you can't control，such as increasing age，family health history，race，and previous stroke．（39）F．Factors resulting from lifestyle or environment can be improved with a health care provider's help．
Breakthroughs in treatment
A stroke can happen to anyone at any moment．In fact，about 600，000people have strokes every year．（40）CHowever，recent breakthroughs have led to new treatments．For the treatments to work，the person must get to a hospital immediately．
A．Risk factors of a stroke．
B．Warning signs of a stroke．
C．For many years，there was no hope for those suffering a stroke．
D．Every 3.1minutes，someone dies of one．
E．When that happens，part of the brain cannot get the blood and oxygen it needs．
F．But you can change or treat other risk factors to lower your risk．
G．The more common kind of stroke is caused by a blood clot that blocks a blood vessel in the brain．
分析 文章讲述了在美国中风已经成为主要的死亡病之一，并且分析了得病的一些因素，好在现在已经在治疗上有重大突破．
解答 DEAFC
36．D 上下文语境．根据前句Every 45seconds，someone in America has a stroke每45秒，就有人得了中风，所以下面 应该提到每3.1分钟就有人死于中风，故D符合语境．
37．E 上下文语境．A stroke occurs when a blood vessel（血管） that carries oxygen and nutrients to the brain is either blocked by a clot or bursts这句话告诉我们当用来输送氧气和营养物质到大脑的血管被阻塞，带来的后果大脑供血或者供氧不足就会发生中风，即选项E．
38．A 概括总结．根据该段The American Stroke Association has identified several factors （因素） that increase the risk of stroke．得知，美国中风协会发现了一些导致中风的因素，故上面小标题应该总说中风的原因．故答案选A．
39．F 上下文语境．前面说Some of these you can't control有些因素是控制不了的，如年龄大以及家族遗传，但你可以减少得病的风险，故选F．
40．C 上下文语境．However，recent breakthroughs have led to new treatments特别是however转折表明前面说很多年中风一直没有得到很好的治疗，现在 已经有很大的突破，故选C．
点评 本文是一篇选句填空，题目涉及多道细节理解题，做题时结合原文和题目有针对性找出相关语句进行仔细分析，结合选项选出正确答案．推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案．
