四级练习2013.06.10
[audio]http://sound.yywz123.com/tingbbs/cet4/cet420130610.mp3[/audio]If you're confused about how much water you really need, I'm not surprised. Conflicting advice in recent headlines appears against the old "8 a day" advice we all grew up with. (1)_________________________________________________? We've heard for years that eight glasses of water daily is the minimum necessary to keep healthy. Your weight loss and health depend on it. Drink the minimum and see clearer skin, better sleep, and improved vision. We're warned of the danger of water shortage in our body without at least eight glasses. But,the tide has turned away from liquid requirement toward examining your daily diet, including what you eat, as well as what you drink. The answer is - you need what you need! If it's summer, you need more. If you're exercising, you need more. If you're a "normal person who sits a lot, who is not sweating, and not exercising more than 15-20 minutes daily, Dr. Heinz Valtin of Dartmouth Medical School says you need no more than four glasses of water daily. (2)_____________________________________. Although the World Health Organization recommends that everyone drink a minimum of two liters of water daily, or about eight cups, the old "8 a day" rule is based on studies performed on people under extraordinary circumstances, (3)__________________________________. What you and I need is different.
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