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
28
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/hkTd777K
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
CustomsoftheWorldIfyoutravelaroundtheworld,youwillbesurprisedtofindjusthowdifferenttheforeigncustomscanbe
Howdoesthedormousedefenditselfagainstcoldinwinter?Accordingtothepassage,whatis"migration"?
Collegesanduniversitiesusuallygivediplomasorcertificatestostudentswhocompletecourserequirementsadequately.
TheJoyofLivingAloneMoreandmoreAmericansarelivingalone.Somelivealonebecauseofdivorceorthedeathofapartne
Practicallyallspeciesofanimalscommunicateeitherthroughsoundsorthroughalargerepertoryofsoundlesscodes.
StressLevelTiedtoEducationLevelPeoplewithlesseducationsufferfewerstressfuldays,accordingtoareportinthecu
MedicalJournalsMedicaljournalsarepublicationsthatreportmedicalinformationtophysiciansandotherhealthprofession
SaveEnergyatHomeOntheaverage,Americanswasteasmuchenergyastwo-thirdsoftheworld’spopulationconsumes.That’s(1)
Hundredsofbuildingswere(wrecked)bytheearthquake.
随机试题
行政立法的一般原则是()。
下列哪一项不属于宏观环境调查中的社会文化因素
京巴犬,半个月来精神、饮食正常,下颌下方逐渐出现馒头大小肿胀,触诊柔软。如该肿胀破溃后流出金黄色带血色黏液,则该病的病因是
由于小儿呼吸道解剖特点,易患下列疾病,但应除外
工程调查时提供工程平面布置图(或线路走向示意图),应标注()。
工资率的上升所导致的替代效应是指()。
一直以来,世界音乐界认为中国没有多部和声艺术,复调音乐仅存于西方。上个世纪50年代,侗族大歌被中国著名音乐家郑律成偶然发现。1986年贵州侗歌合唱团赴法国演出时引起轰动,音乐界惊叹这是中国音乐史上的重大发现,从此扭转了国际上关于中国没有复调音乐的说法。侗族
下列哪一条不属于数据库设计的任务?()
WhatwillCanadianparentsdowhentheirchildrenover18keepstayingathome?Whatdoestheunderlinedpart"focuson"meani
Hisdoctorhastoldhimhemustn’tdrink,buthestillhastheoccasionalbrandy______.(2013年3月中国科学院考博试题)
最新回复
(
0
)