It has become a certain belief among the public----drink at least eight glasses of water a day to improve health and wellbeing. Bottled water companies often repeal it to increase their sales but it is actually a silly idea. There is no evidence to prove the advantages of drinking eight glasses of water a day, scientists say.
The misunderstanding is caused from the suggestion that adults should drink 2.5 liters of water daily, which was stressed by the British Medical Journal in December. The important part of the suggestion that most of this quantity of water is contained in prepared foods, however, is usually ignored.
US researchers who reviewed the evidence concluded that most people do not need to worry about the amount of water they drink every .day. Besides drinking water, they will be getting plenty of liquid(液体)in other ways. Caffeinated drinks such as tea, coffee and cola and alcohol(酒)can help reach the daily total if they don't drink too much, though these drinks help the production of urine (尿). Less well known arc the dangers of drinking too much water, causing water poisoning, low salt levels and even death.
The review of research by Dan Negoianu, from the University of Pennsylvania, found that not a single study included the suggestion of drinking eight glasses of water a day. Although one small study suggested that drinking water could result in fewer headaches, the results were not very important. However, the benefits of drinking some water to prevent a pain in head after drinking too much alcohol are, separately, proved to be true.
No studies showed any advantages to the color of the skin because of the increased water taken into bodies. Dehydration(脱水)can make skin less pleasant, but there was no clear evidence to support the idea that water helps people keep a youthful appearance. The researchers also found no evidence that drinking lots of water does some good to the body's organs(器官).
28. From the passage, we know that the suggestion about drinking eight glasses of water a day .
A. causes some serious diseases
B. has enough scientific evidence to support it
C. is misunderstood by people in fact
D. was published by the British Medical Journal
29. From the passage we learn that many people don't know that .
A. the production of urine can cause water to lose
B. health can be improved by drinking plenty of' water
C. better skin can result from intake of much water
D. caffeinated drinks can provide the water people need
30. What can be proved about drinking a lot of water according to the passage?
A. Reducing the bad influence of drinking alcohol.
B. Helping to keep youthful looks.
C. Making the body's organs stronger.
D. Causing bad headaches.
31. The writer's main purpose of writing this passage is to .
A. persuade people to drink different kinds of water
B. tell people drinking much water is not as healthy as is considered
C. warn people of the danger of drinking much water
D. help people realize the importance of drinking enough water every day
CDAB
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。
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A. The effects of flu and its symptoms B. Types of virus to cause flu C. People’s attitudes toward flu D. The cause of flu E. The way that flu spreads F. The methods to fight flu |
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Flu (which is short for influenza) is a highly infectious disease, the cause of which is a very tiny organism known as a virus. Several types of flu are recognized, depending on the type of virus that causes the disease.
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Flu can often cause problems in breathing, and general infection of the lung. With elderly and weak people, these added complications often produce serious results. The virus, if not properly treated, can weaken the body so that patient may develop more serious illnesses, such as pneumonia and bronchitis. When people catch flu, they often complain of a headache or a sore throat. They usually have a fever and their temperature rises from the normal 37℃ (98.6) to about 39.5℃ (103). Sometimes a person has a dry hacking cough and aching joints.
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Today many doctors use drugs that fight the disease. And scientists have also developed vaccines that help to prevent it. If the patient has proper treatment, and complete rest in bed, the virus is normally beaten within a week to ten days.
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How does flu spread so quickly? When the infected person breathes out, sneezes or coughs, he gives out droplets of moisture in the breath from his mouth or nose. These remain in the air for some time. Flu viruses are present in these droplets. If a person sneezes in a crowd or poorly ventilated place, such as a lift, viruses can easily be carried from an infected person to a healthy person. This is known as droplet infection. The healthy person will breathe in the viruses given out by the infected person.
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There are three main types of virus that cause flu, which are called type A, B and C. type A is the most powerful of the three, and undergoes minor changes in its genetic material every few years. The new form of the virus is called a strain. The new strain is not affected by the current vaccines. It is said to be “resistant” to them. So doctors must be continually producing new vaccines to combat the new strains of virus.