阅读理解。 This is a dangerous world we live in. The number of murders go

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This is a dangerous world we live in. The number of murders goes up every year, people are dying of cancer, more people contract (感染)HIV, more teens are using drugs, etc. You know this becau you've heard all the statistics on the news and in the paper. But do you really have an accurate idea what they mean? The numbers are going up, but how do they compare to the growth in population? Are more cas of the dias being reported becau of better testing techniques, or are the dias more common? The fact is that without knowing the background statistics mean very little. This growing trend of reporting only part of the information is becoming dangerous. For example, veral years ago a high school student reported the dangers of the chemical known as dihydrogen monoxide. This chemical,found in most cancerous umors(肿瘤 ) ,is often found in the blood of people drunk on alcohol, and caus complete physical and mental dependence for tho who take the chemical even once. After reading his report, more than 75% of his Advanced Placement Chemistry class voted to forbid this dangerous chemical! Every one of the above statements is true, yet this chemical is necessary to all life on earth. The students made the mistake becau they voted knowing only a few statements and statistics, rather than the chemical's full background. The point of this article is that one should be aware of what is and is not being said. When one finds a new fact or number , one should try to consider other important information before forming an opinion with only half-truths. Always remember that the author is trying to convince you of his or her own view, and will leave out information that is different to his view. For example, look again at the statistics that suggest skiing is safe. only 32 people may die each year when skiing, while 897 die from lightning strikes, but which is really the most dangerous? If you think about it, you realize far fewer people go skiing each year than the number of people who are in danger of a lightening strike. When you think about it ,skiing is more dangerous than you might at first think when looking at statistics. lf we teenagers are to be left this world. we had better be able to think critically, and form our own views, rather than be easily persuaded by another's. To be warned is to be prepared.

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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。