Ⅰ.阅读理解
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 repeat 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 highlighted(强调)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.
U．S.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 are 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)．
语篇解读：本文是一篇说明文。证据表明过多的喝水对身体健康并没有人们所认为的那么多好处。
1．From the passage, we know that the suggestion about drinking eight glasses of water a day ．
A．causes some serious diseases
B．is misunderstood by people in fact
C．has enough scientific evidence to support it
D．was published by the British Medical Journal
解析：选B 细节理解题。第一段提到， 公众普遍认为每天至少喝八杯水能提高健康水平， 但实际上这是个错误的想法。科学家说没有证据来证明每天喝八杯水对健康有好处。所以每天至少喝八杯水能提高健康水平是被人们误解了。
2．What can be proved about drinking a lot of water according to the passage?
A．Causing bad headaches.
B．Helping to keep youthful looks.
C．Making the body's organs stronger.
D．Reducing the bad influence of drinking alcohol.
解析：选D 细节理解题。根据第四段最后一句“However, the benefits of drinking some water to prevent a pain in head after drinking too much alcohol are separately, proved to be true.”可知，多喝水可以减少饮酒的不良影响。
3．The writer's main purpose of writing this passage is to ．
A．persuade people to drink different kinds of water
B．warn people of the danger of drinking much water
C．tell people drinking much water is not as healthy as is considered
D．help people realize the importance of drinking enough water every day
解析：选C 写作意图题。第一段提到， 科学家指出， 喝水不像人们认为的那样对健康有好处。最后一段又强调没有明确的证据表明喝水对皮肤有好处。故作者写这篇文章的目的是告诉人们喝大量的水未必像人们认为的那样对健康有好处。
