Question

阅读下列短文，从每题所给的四个选项中，选出最佳选项。

　　Many people believe they are supposed to drink eight glasses of water a day，or about two liters．Why？Because that is what they have been told all their life But a new report offers some different advice．Experts say people should obey their bodies；they should drink as much water as they feel like drinking．

　　The report contains some general suggestions．The experts say women should get about two-point-seven liters of water daily．Men should get about three-point-seven liters．But wait-in each case，that is more than eight glasses．

　　There is an important difference．The report does not tell people how many glasses of water to drink．In fact，the experts say it may be impossible to know how many glasses are needed to meet these guidelines．This is because the daily water requirement can include the water content in foods．

　　People do not get water only by forcing themselves to drink a set number of glasses per day．People also drink fruit juices and sodas and milk．They drink coffee and tea．These all contain water．As you might expect，the Institute of Medicine says people need to drink more water when they are physically active．The same is true of those who live in hot climates．Depending on heat and activity，people could need twice as much water as others do．

　　All this，however，does not answer one question．No one seems sure why people have the idea that good health requires eight glasses of water daily．It may have started with a misunderstanding．In nineteen-forty-five，the National Academy of Sciences published some guidelines．Its Food and Nutrition Board said a good amount of water for most adults was two-point-five liters daily．This was based on an average of one milliliter for each calorie of food eaten．

　　But that was only part of what the board said．It also said that most of this amount is contained in prepared foods．

1．According to the report，how much water should people drink a day？

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A．8 glasses of water．

B．Less than 8 glasses of water．

C．More than 8 glasses of water．

D．No definite answer．

2．What seems to be reasonable according to the report concerning drinking water？

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A．To keep healthy，people had better force themselves to drink a set number of glasses a day．

B．Women should drink more water the men and both should drink more than 8 glasses a day．

C．People need to drink more water when they are doing sports or living in hot places．

D．Instead of drinking water，people are supposed to drink fruit juices and sodas and milk．

3．In the sixth paragraph，the writer mainly tells us________．

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A．why good health eight glasses of water daily

B．how the idea good health requires eight glasses of water daily affects people

C．the National Academy of Sciences mislead people in drinking water

D．how people got the idea of good health requires eight glasses of water daily

Answer 1

答案：D;C;D
解析：

文章第一段提出人们每天应该喝八杯水，第二段提出女性和男性各应该喝多少杯水，最后一段又提出这些水都包含在食物中了，也就是说不需要在吃饭以外再喝水了，因此说文章没有确定的答案。 　　由第四段第四、五行可知。 　　在 1945年，the National Academy of sciences出版健康标准的书籍，因此，人们了解了应该喝水的量。