题文
阅读短文，从A-F中选出正确答案。 A. Causes of dental fluorosisB. Negative effects of fluoride
C. Safe use of fluoride
D. The expert's background information
E. No need to worry about fluoride poisoning
F. Solutions to improper use of fluoride I have heard that fluoride can help stop dental decay, but I recently read that it is poisonous. Which of these
is true? How can children use fluoride safely?
1.______
This question is answered by Dr Marcia M. Rich who practises general dentistry in Newholt. She is also a
lecturer at the University and a writer for the monthly magazine Your Dentist Cares.
2.______
My answer to the first question is to stress that fluoride works well and is safe when users follow
instructions. Young children have a tendency to swallow toothpaste, which is why they should only have a tiny
amount of fluoride toothpaste on their toothbrush. If this simple measure is taken, parents can be confident that
children will be protected against tooth decay, and come to no harm.
3.______
Almost all medicines can have an adverse effect-or even be deadly-if they are not taken as directed. So you
are right-fluoride can be poisonous if it is swallowed in very large quantities. It is for this reason that fluoride
supplements can only be obtained on prescription from a doctor or a dentist. Please be assured that fluoride
overdoses are rare-in fact, I have never heard of any fatal incidents related to fluoride poisoning.
4.______
Scientific studies have shown that fluoride can help to prevent cavities as long as it is used correctly. If
fluoride is abused, there is a risk of illness or even death in extreme cases. If a deadly amount of fluoride is
taken, immediate first-aid could save a life. A person who has swallowed a large amount of fluoride will probably
start vomiting. lf not, the patient should be given milk or antacid and taken to the nearest hospital for emergency
treatment.
5.______
Taking too much fluoride while teeth are growing can lead to a condition called dental fluorosis. The most
likely cause is the swallowing of fluoride toothpastes by young children. It can also be caused by the
inappropriate use of fluoride drops or other fluoride supplements, for example when fluoride is already present
in drinking water. 题型：未知难度：其他题型
答案
1-5: D C E F A解析
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考点
据考高分专家说，试题“阅读短文，从A-F中选出正确.....”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。
