2．The main cause of death and disability in the US Stroke（中風）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（動脈） 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 文章講述了在美國中風已經(jīng)成為主要的死亡病之一，并且分析了得病的一些因素，好在現(xiàn)在已經(jīng)在治療上有重大突破．

解答 DEAFC
36．D 上下文語境．根據(jù)前句Every 45seconds，someone in America has a stroke每45秒，就有人得了中風，所以下面 應(yīng)該提到每3.1分鐘就有人死于中風，故D符合語境．
37．E 上下文語境．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這句話告訴我們當用來輸送氧氣和營養(yǎng)物質(zhì)到大腦的血管被阻塞，帶來的后果大腦供血或者供氧不足就會發(fā)生中風，即選項E．
38．A 概括總結(jié)．根據(jù)該段The American Stroke Association has identified several factors （因素） that increase the risk of stroke．得知，美國中風協(xié)會發(fā)現(xiàn)了一些導(dǎo)致中風的因素，故上面小標題應(yīng)該總說中風的原因．故答案選A．
39．F 上下文語境．前面說Some of these you can't control有些因素是控制不了的，如年齡大以及家族遺傳，但你可以減少得病的風險，故選F．
40．C  上下文語境．However，recent breakthroughs have led to new treatments特別是however轉(zhuǎn)折表明前面說很多年中風一直沒有得到很好的治療，現(xiàn)在 已經(jīng)有很大的突破，故選C．

點評 本文是一篇選句填空，題目涉及多道細節(jié)理解題，做題時結(jié)合原文和題目有針對性找出相關(guān)語句進行仔細分析，結(jié)合選項選出正確答案．推理判斷也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確的答案．

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