科目: 来源:上海高考真题 题型:阅读理解
| 阅读短文,从A-F中选出正确答案。 | |
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| 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. |
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科目: 来源:模拟题 题型:阅读理解
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科目: 来源:福建省期中题 题型:阅读理解
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科目: 来源:福建省期中题 题型:填空题
| 短文填词。 | ||
| 阅读下面短文,根据下列提示: 1)汉语提示, 2)首字母提示, 3)语境提示, 在每个空格内填入一个适当的英语单词,并将该词完整地写在右边相对应的横 线上.所填单词要求意义准确,拼写正确.
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科目: 来源:江西省同步题 题型:阅读理解
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科目: 来源:江西省同步题 题型:阅读理解
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科目: 来源:江西省同步题 题型:阅读理解
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科目: 来源:辽宁省期中题 题型:阅读理解
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科目: 来源:吉林省同步题 题型:阅读理解
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科目: 来源:江苏省期中题 题型:阅读理解
| 阅读理解 China's government has been trying all measures to reduce pollution in the past few years. Now people can enjoy a fresh environment everywhere. The following two graphs are adopted from the column of "City Information" on the webpage of Beijing Review. Graph 1: Olympic Cities Air Quality Report
**API stands for Air Pollution Index(指数). **Particulate matter (PM10) is a major component of air pollution that threatens both our health and our environment. It consists of very small liquid and solid particles floating in the air. **Sulfur dioxide(SO2) acts as an acid.Inhalation(吸入) results in labored breathing, coughing, or a sore throat and may cause permanent lung damage. 1. According to Graph 1, which of the following cities has the worst air pollution? A. Qinhuangdao. B. Tianjin. C. Qingdao D. Shenyang. . 2. If your city is symbolized by either red or purple, the pollution in your city is . A. Moderate or high. B. Moderate or slight. C. Medium or high. D. Medium or slight. 3. Which of the following statements is TURE? A. With API value below 150 the air is free from being polluted. B. The colors from purple to Yellow indicate the air quality is becoming much worse. C. When there are floating solid particles and dust in the air, it is dangerous pollution. D. On September 8th the color-symbol of Beijing City's air quality is 'Blue'. 4. When more citizens are beginning to have labored breathing soon after they are in the open air, it suggests that . A. there is a large amount of sulfur dioxide in the air B. it is so cold that they may have caught a cold C. they are starting to cough or have a fever D. they must be infected with permanent lung disease |
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