It is better to drink smaller quantities of water more frequently than to drink a lot of water at one time.It is recommended to drink 8 to 12 ounces a day and if you have not been drinking water regularly，you should double the recommended amount because your cells are already dehydrated.Make sure that you don't drink too much water in the morning prior to any physical activity.It is very essential to plan a proper routine for water drinking.

　　Water which is not harmful to health and has all qualities to serve as drinking water is called potable water.The potable water must be free from heavy metals，suspended particles and pathogens like bacteria.The polluted sky，dusty winds，chemicals spewed(涌出)from industries get dissolved with rainwater，causing acid rain.It is not advisable to drink such rainwater.

　　36．According to the first paragraph，water________.

　　A．can help to purify your body

　　B．has some digestive functions

　　C．will mix with vitamins and nutrients

　　D．can prevent all kinds of diseases

　　37．In order to lose weight you'd better________.

　　A．eat food containing water

　　B．refuse to take in calories

　　C．take part in more physical activities

　　D．drink enough water every day

　　38．We can infer from the third paragraph that we should ________.

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