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 1945， the National Academy of Sciences published some guidelines.

　　Its Food and Nutrition Board said a good amount of water for most adults was two­point­five 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.

　　How much water should we drink every day？

　　Belief or Advice The (1)　 of water needed daily

　　Traditional public belief Men Eight glasses of water Women (4)　 glasses of water

　　(2)　 report offers Men (3)　 liters of water Women 2.7 liters of water

　　While doing hard (5)　 or living in the hot (6)

　　Men 7.4 liters of water Women (7)　 liters of water

　　Generally­suggested amount of water needed daily

　　According to the National Academy of Sciences，most adults need 2.5 liters of water (8)　，and (9)　of the amount is (10)　 in prepared foods.

　　答案：1.amount/quantity　2. Recent　3. 3.7　4. Eight　5. labor/work　6. weather/climate　7. 5.4 　8. daily

　　9. most　10.contained

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