Most American kids love Halloween treats, but a bucket of Halloween candy ca

题文

Most American kids love Halloween treats, but a bucket of Halloween candy can be a dentist's nightmare. Some parents try to get rid of half of the candy after their children go to bed, but dentists say parents also need to parate the good kinds of treats from the bad ones. It is not exactly what a child eats that truly matters, but how much time it stays in his mouth. According to pediatric dentist Dr. Kaneta Lott, the most damaging stuff is something that is sticky or very hard and thus stays in the mouth for a long time.This is becau we all have bacteria in our mouths.When we eat, the bacteria take our food as their food and produce an acid that destroys the surfaceof the teeth, causing cavities to form. The longer the food stays in the mouth, the more likely cavities will develop. Therefore, potato chips are wor than candy becau they get stuck between teeth. Forthe same reason, raisins and crackers are not the best choice. Hard candies take a long time to consume and are also a bad choice for Halloween treats. If children really love candy, dentists recommend that they eat chocolate instead. Unlike hard candies, chocolate dissolves quickly in the mouth.Besides, chocolate contains tannins, which help tokill some of the bacteria in the mouth.But no matter what a child eats, brushing after each meal is still the best way to fight cavities.1. What is the main purpo of this passage?A. To discuss how cavities can be treated.B. To point out the problems with Halloween celebrations.C. To tell parents what sweets are less damaging to their children’s teeth.D. To teach parents the meaning of Halloween candy for their children.2. Why are hard candies especially bad for teeth?A. They may break the children’s teeth.B. They contain too much sugar.C. They help bacteria to produce tannins.D. They stay in the mouth for a long time.3. According to the passage, which of the following is a better choice for Halloween treats?A. Chocolate.   B. Crackers.C. Raisins.  D. Potato chips.4. According to the passage, which of the following is true of tannins?A. They are produced when the bacteria digest the food.B. They help to get rid of some bacteria in the mouth.C. They help chocolate to dissolve more quickly.D. They destroy the surface of the teeth. 题型：未知难度：其他题型

答案

1-4: CDAB

解析

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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。