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高中三年级英语

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    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 separate 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 because 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 surface
    of the teeth, causing cavities to form. The longer the food stays in the mouth, the more likely cavities
    will develop. Therefore, potato chips are worse than candy because they get stuck between teeth. For
    the 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 to
    kill 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 purpose 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.
    本题信息:2012年同步题英语阅读理解难度较难 来源:张铁富(高中英语)
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       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;
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