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  3. Drinking eight full glasses of water a day may do little more than make a person run to the bathroom, a researcher said. New

Drinking eight full glasses of water a day may do little more than make a person run to the bathroom, a researcher said. New

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问题     Drinking eight full glasses of water a day may do little more than make a person run to the bathroom, a researcher said.
    Newspaper articles, health and beauty magazines all advise drinking at least 8 glasses of water a day【R6】______64 ounces for optimal health—an approach called "8 x 8". But Dr. Heinz Valtin of Dartmouth Medical School in New Hampshire said there is no scientific【R7】______to back up this advice, which has helped create a【R8】______market for bottled water.
    "After 10 months of careful searching I have found no scientific evidence that supports ’8 x8’," Valtin who has written textbooks on the subject of human water【R9】______, said in a telephone interview.
    Writing in the American Journal of Physiology, Valtin, a kidney(肾)specialist, said people forget that the food they eat also【R10】______some water.
    The Food and Nutrition Board of the National Research Council has recommended that people take in about one milliliter of water for each calorie of food eaten.
    This adds up to two liters, or 74 fluid ounces on an【R11】______2000-calorie diet. But the National Research Council also【R12】______that much of this is already contained in food.
    " I did 43 years of research on that system, which is so【R13】______and so fast that I find it impossible to believe that evolution left us with a chronic(长期的)water deficit(短缺额)," Valtin said. "If a person gets low on【R14】______, the body compensates by bringing fluid back out of the kidneys and by slowing the loss of water through the skin. " Thirst【R15】______in long before dehydration starts, he added.
A. kicks B. solid C. balance D. regular E. contains
F. precise G. immense H. noted I. evidence J. average
K. includes L. fluid M. huge N. proof O. totaling
【R13】
选项
答案F
解析 此处应填形容词。文章意思是：人类体内的水平衡是如此的精确、如此的快捷，所以我不相信进化过程会留给我们长期的缺水缺陷。故F正确。precise，准确的，精确的。
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