题文
Holding a cell phone against your ear or storing it in your pocket may be dangerous to your health. This explains a warning that cell phone manufacturers include in the small print that is often ignored when a new phone is purchased. Apple, for example, doesn’t want iPhones to come closer to you than 1.5 centimeters; Research In Motion, BlackBerry’s manufacturer, recommends 2.5 centimeters.If health issues arise from cell phone use, the possible effects are huge. Voice calls - Americans chat on cell phones 2.26 trillion(万亿)minutes annually - earn $109 billion for the wireless carriers.
Devra Davis, an expert who has worked for the University of Pittsburgh, has published a book about cell phone radiation, “Disconnect.” The book surveys scientific research and concludes the question is not settled.
Brain cancer is a concern that Ms. Davis examines. Over all, there has not been an increase in its incidence since cell phones arrived. But the average masks an increase in brain cancer in the 20-to-29 age group and a drop for the older population.
“Most cancers have multiple causes,” she says, but she points to laboratory research that suggests low-energy radiation could damage cells that could possibly lead to cancer.
Children are more vulnerable（易受伤的）to radiation than adults, Ms. Davis and other scientists point out. Radiation that penetrates only five centimeters into the brain of an adult will reach much deeper into the brains of children because their skulls are thinner and their brains contain more absorptive fluid（易吸收的液体）. No studies have yet been completed on cell phone radiation and children, she says.
Henry Lai, a research professor in the bioengineering department at the University of Washington, began laboratory radiation studies in 1980 and found that rats exposed to radiation had damaged DNA in their brains.
Ms. Davis recommends using wired headsets or the phone’s speaker. Children should text rather than call, she said, and pregnant women should keep phones away from the abdomen（腹部）.
小题1:According to Ms Davis, brain cancer increase ____.A．among childrenB．among old peopleC．in the twentiesD．among pregnant women小题2:Why do children easily be affected by radiation?A．Because they haven’t grown up. B．Because they are too young to protect themselves.C．Because they use cell phones more often than adults.D．Because their skulls are thinner and their brains are easily hurt.小题3:What can we conclude from the last paragraph?A．Pregnant women should keep cell phones away.B．People should use cell phones in the correct way.C．If you are a child, you’d better text than make phone calls.D．When you use a cell phone, use a wired headset or the phone’s speaker.小题4:What does the passage mainly talk about?A．Be careful when using cell phones.B．Don’t hold your cell phone against your ear.C．Rats exposed to radiation have damaged DNA in their brains.D．Low-energy radiation could damage cells that could lead to cancer. 题型：未知难度：其他题型
答案
小题1:C
小题2:D
小题3:B
小题4:A
解析
本文讲述的是使用手机会带来辐射的负影响，因此需要正确使用手机。
小题1: C. 细节理解题。根据第四段“But the average masks an increase in brain cancer in the 20-to-29 age group and a drop for the older population”可脑癌主要发生在20多岁的时候，故选C项。
小题2: D. 细节理解题。根据“Radiation that penetrates only five centimeters into the brain of an adult will reach much deeper into the brains of children because their skulls are thinner and their brains contain more absorptive fluid（易吸收的液体）”可知，小孩更容易受辐射的影响是因为他们的头骨更薄，大脑更容易受伤，故选D项。
小题3: B. 推理判断题。最后一段“Ms. Davis recommends using wired headsets or the phone’s speaker. Children should text rather than call, she said, and pregnant women should keep phones away from the abdomen”所讲述的都是一些正确使用手机以防止辐射的影响的方法，由此判断选B项。
小题4:A. 主旨大意题。本文主要介绍使用手机的负作用，最后警示人们要正确使用手机。因此A项更能说明全文的主旨，而其它三项只是文中的细节内容，故选A项。
点评：本文讲述的是使用手机会带来辐射的负影响，因此需要正确使用手机。文章基本上是考查细节题，对此类题型考生可以首先从问题中找到关键词，然后以此为线索，运用略读及查阅的技巧在文中迅速寻找这一细节，找到后再把这一部分内容仔细阅读一遍，仔细比较所给选项与文中细节的细微区别，在准确理解细节的前提下，最后确定最佳答案。
考点
据考高分专家说，试题“Holding a cell phone.....”主要考查你对 [健康环保类阅读 ]考点的理解。健康环保类阅读
健康环保累阅读概念：
健康环保类文章常是介绍科学知识、生活常识和环境保护方面的短文。体裁有记叙文、 说明文、议论文和各种应用文。
健康环保类文章阅读技巧：
健康环保类文章常是介绍科学知识、生活常识和环境保护方面的短文。阅读此类短文要以现象或事物为中心进行思考，理解现象产生的原因、条件和客观规律等。同时要抓住事物的特征、用途和相互关系等。科普环保类文章一般为说明文，从结构上看大致可分为三个部分：
第一部分一般是文章的首段，主要用来提出文章的主题，即文章想要阐述、说明的主要内容；
第二部分是文章的主体，可由若干个段落组成，对文章的主题进行展开说明；
第三部分是结尾段，对文章的主题进行归纳总结。这类文章多用一般现在时，而且一般多使用客观性词语表述。有时为了强调客观性，也常使用被动语态。
从近几年的考试题来看，科普环保类的文章越来越与人们的实际生活相接近。由于此类文章缺乏故事情节，很多同学对此类文章感到费解。但一般的科普类文章都是就事论事，需要逻辑推理和想象的时候较少，因此此类阅读题也没有同学们想象中的那么难，只要多加训练，就能较好地答题。
【阅读策略】
1、概要(Summarizing)：
阅完材料后，将所阅材料浓缩，摘要，做出所阅材料的书面或口头梗概。
2、组织(Organization)：
阅读后根据阅读内容，识别观点、人物、事件之间的关系以及文章的结构关系。如：时间关系、比较或对比关系、相关关系及因果关系等。
