24． Water
Of all the things we eat and drink, water is the most important. Not all people realize this, but it is quite true. The human body can live without food for a long time, but two or three days without water usually result in death.
Many people do not understand how much water the human body needs, but many people do not drink enough，especially in the hot weather．Most people drink when they are thirsty and often need more water after exercises．
65 to 75 percent of the human body is water. Water is important in several different ways．Most people need about five to seven liters of water every day，but we need not drink this amount because a lot comes from the food we have．If we don't have enough water, however, we will feel tired and may become ill．Do you know what the best drink is？Yes, you are right：Cold water！
水
在我们所有的食物和饮料中，水是最重要的。并不是所有人都意识到这一点，但这是千真万确的。在不进食的情况下，人可以支持很久，但如果不喝水，两三天就会死。
许多人并不清楚人体需要多少水，但他们饮水不够量，尤其在炎热的天气里。大多数人感到口渴时才喝水，而且通常人在运动后需要更多的水。
人体的65%～75%是水。水的重要作用表现在几个不同的方面。大多数人每天需要5～7升水, 但由于我们可以从食物中获得许多水分，所以不必喝这么多。如果我们（身体里）水分不足，就会感到疲劳，并且可能会生病。你知道最好的饮料是什么吗？是，你说的对：冰水！
参考译文
词汇：
Realize 实现，认识到 result 导致，结果
Especially 特别，尤其 thirsty 口渴的
Liter 公升 amount 总数，量
However 然而
I．听全文录音，选择正确答案
1 ．In the writer's opinion， .
A .all the people realize that water is the most important thing of
what we eat and drink
B ．many people don’t drink enough
C .the human body can live without water for 7 days
D .people should drink only when they are thirsty
2． percent of the human body is water.
A. 55 to 65．65 to 75
C. 75 to 85 D. 50
3 ．We need not drink 5 to 7 liters of water every day because .
A ．we don’t need so much
B .we are not thirsty
C .some comes from the food we have
D ．we don’t have so many exercises
II .听录音，补全下列段落
1 To 2 percent of the human body is water. Water is important in 3 different ways．Most people need about 4 to 5 liters of water every day，but we need not drink this amount because a lot comes from the 6 we have．If we don’t have enough water, however, we will feel 7 and may become 8. Do you know what the best 9 is？Yes，you are right： 10 water！
答案:
I ．1．B 2. B 3．C
II．1 ．65 2．75 3．several 4.5 5. 7
6．food 7．tired 8．ill 9．Drink 10．Cold
