首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Water is a kind of chemical substance.
Water is a kind of chemical substance.
admin
2009-06-24
63
问题
Water is a kind of chemical substance.
Every year there are reports of people dying as the result of extremely hot weather. Many of the victims are old persons, whose hearts or breathing systems decline. But many die from lack of water.
Water is necessary for life and good health. We often forget this fact when we think about 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. New born 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 does many different things to keep us healthy. It carries hormones, antibodies and foods through the body, and carries away waste materials. That is why different parts of the body contain different amounts of water. For example, blood is 83% water, muscles are 75% water, the brain is 74%, and bones are 25%.
Water is also 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 say 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.
Researchers also 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.
The body loses water every day through perspiration and urine. If we lose too much, we will become sick. A 10% drop in body water can cause the blood system to fail. A 15%~20% drop usually leads to death. To replace what is lost, health experts say growing 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. Meats are 50%~60% water. And even bread is about 33% water. Water may be one of the most simple of all chemical substances, but it is the most important substance that we put into our bodies.
选项
A、Right
B、Wrong
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/w6Td777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
Thechemicalisdeadlytoratsbutsafetocattle.
Thechemicalisdeadlytoratsbutsafetocattle.
Theuseofthechemicalmaypresentacertainhazardtothelaboratoryworkers.
Alllivingorganisms,regardlessoftheiruniqueidentity,havecertainlogical,chemical,andphysicalcharacteristicsincommo
Waterisakindofchemicalsubstance.
Waterisakindofchemicalsubstance.
Waterisakindofchemicalsubstance.
随机试题
使用电接点水位表应注意哪些问题?
简述自愿原则在证券法上的具体体现。
男,19岁,患病一周,牙龈乳头坏死,前牙唇侧明显,坏死形成溃疡处凹陷,表面灰白色假膜,触之出血明显,口腔有腐性口臭。体温37.8℃,颏下淋巴结肿痛,既往未出现全身明显异常现象。有辅助诊断意义的检查是
下列哪些自诉案件既可以调解又可以进行反诉?()
资本化率和报酬率都是将房地产的未来预期收益转换为价值的比率,前者是某种年收益与价格的比率,并不明确的表示获利能力;后者是用来除一连串的未来各期净收益,以求得来来各期净收益现值的比率。()
企业资本公积、盈余公积和未分配利润属于企业生产经营过程中形成的留存收益。()
我国就业服务体系的主要内容包括()。
最近公布的一项国家特别咨询委员会的调查报告声明:在选择了大量的研究对象进行对比实验后,发现在名人家族中才能出众者是普通人家族中才能出众者人数的23倍,因此我们可以得出信度很高的结论,人的素质主要是由遗传决定的。以下哪项如果为真。则最能削弱上述结论
ACaliforniansealioncalledRiohasastonishedhertrainersandmayshakeuptheworldofanimalscienceafterrememberingac
Itishardtoloveants.Spidersandscorpionsexcepted,theyareprobablyourleastfavoriteinsect.Theygivenohoney;theyd
最新回复
(
0
)