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
2011-02-16
15
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、True
B、Fasle
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/o6Xd777K
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
Accordingly,anumberofothermethodshavebeenemployed
CellPhones:HangUporKeepTalking?Millionsofpeopleareusingcellphonestoday.Inmanyplacesitisactuallyconsider
Therecyclingofaluminumconservesninety-fivepercentoftheenergyneededtomakenewmetal.
Howtechnologypushesdownprice1.Priceshavefalleninthefoodbusinessbecauseofadvancesinfoodproductionanddistri
BuickinChinaThefirstBuickmodeloffthelinewasjustthebeginningofGeneralMotors’longmarchintotheChinesemark
Thechangeinthatvillagewasmiraculous.
SexChangeSurgeryGuidelinesDraftedChinaissettoissueitsfirstclinicalguidelineonsex-changesurgery,accordingto
SexChangeSurgeryGuidelinesDraftedChinaissettoissueitsfirstclinicalguidelineonsex-changesurgery,accordingto
AImportanceofClassroomLearningBTelevision--ARichSourceofInformationCAdvertisementsasImportantMessagesfromt
Waterisakindofchemicalsubstance.
随机试题
法国第一部资产阶级共和制宪法是()
下列选项中,属于担保物权范围的是()
按照决策的重复性划分,可以将决策划分为
关于靶区设计,描述不正确的是
病毒感染的血清学诊断,常用方法有
化痰止咳平喘药作用是( )。
病人,男性,患肾炎已3年。近日发现尿少,晨起眼睑肿胀,内生肌酐清除率为45ml/min。内生肌酐清除率实验结果提示
下列说法错误的是()。
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupplyallthesewereimportant【C1】______inhelpingEng
《三国演义》(RomanceoftheThreeKingdoms)是一部由罗贯中创作于14世纪的中国历史题材的小说。小说以汉朝末年和三国这段动荡(turbulent)时期里发生的一系列重大事情为背景。小说篇幅长达80万字,分为120个章节,共描述了
最新回复
(
0
)