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  3. Water is necessary for life and good health. We often forget this fact when we think a-bout the other building blocks of life su

Water is necessary for life and good health. We often forget this fact when we think a-bout the other building blocks of life su

admin2013-12-08  35
问题     Water is necessary for life and good health. We often forget this fact when we think a-bout the other building blocks of life such as vitamins, minerals and proteins. We can live for many days without eating, but two or three days without water usually leads to death.
    The human body may look solid, but most of it is water. Newborn babies are as much as 85% water. Women are about 65% water and men about 75%. Women usually have less water than men because women, in general, have more fat cells, and fat cells hold less water than other kinds of cells.
    Water is necessary for cooling the body under hot weather and when we are working hard or exercising, water carries body heat to the surface of the skin, where the heat is lost through perspiration.
    Researchers note that fat cells block body heat from escaping quickly. Fat cells under the skin act like warm clothing to keep body heat inside. This is why overweight people have a more easy time staying cool than thin people.
    Researchers also note that cool liquids cool us faster than warm liquids, because cold liquids take up more heat inside the body and carry it away faster. They say, however, that cold sweet drinks do not work well because the sugar slows the liquid from getting into the blood stream.
    The body loses water every day through perspiration and urine. If we lose too much, we will become sick. To replace what is lost, health experts say grown persons should drink about 2 liters of liquids each day, and more in hot weather. They say we can also get some of the water we need in the foods we eat. Most fruits and vegetables are more than 80% water. And even bread is about 33% water.
The author suggests that on hot summer days one should drink______.
选项 A、water milk
B、iced tea
C、cold Coca-Cola
D、hot coffee
答案B
解析 本题为推理判断题，提问的是作者建议在夏天应该喝下列哪种饮料降温。文章的倒数第四段讨论的是人们所摄入液体降温的效果。冷水同热水相比能更快地带走人体内的热量，但是甜的冷饮并不能快速降温是因为液体中的糖分会使其进入血液循环的速度减慢。所以作者应会建议没有糖分的凉茶作为降温的饮料，所以答案为B)。
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成人本科学位英语

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