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
84
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/r6Td777K
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
TheBeginningofAmericanLiteratureAmericanhasalwaysbeenalandofbeginnings.AfterEuropeans’discovered’Americain
NorwichNorwich,thecapitalofthepartofBritainknownasEastAnglia,hasbeeninexistenceformorethantwothousandy
LondonCabbies(出租车司机)Everycityintheworldhastaxistotaketouriststointerestingplaces.Londonistheonlycityint
ManofFewWordsEveryonechasessuccess,butnotallofUSwanttobefamous.SouthAfricanwriterJohnMaxwellCoetzeei
For2,005years,Irelandhasbeenthebestplaceforhumanstolivein.IrelandispositionedatNo.1becauseitcombinesthe
TooLatetoRegretItWhenIwasajunior,Imetasecond-yearstudentinmydepartment.Hewasn’ttallorgood-looking,but
SendingE-mailstoProfessorsOnestudentskippedclassandthensenttheprofessorane-mail(51)forcopiesofherteaching
ThebeginningofAmericanliteratureAmericanhasalwaysbeenalandofbeginnings.AfterEuropeans"discovered"Americain
MysteriousNazcaDrawingsOneofthemostmysteriousarchaeologicalspectaclesintheworldistheimmensecomplexofgeo-me
Thepurposeofinsuranceisto______.Whatadvantagewilltherebeifonebuyslifeinsuranceinsteadofmakingotherinvestme
随机试题
A.胸椎内鳞状细胞癌B.乳腺导管内癌C.胃溃疡癌变累及深肌层D.卵巢交界性浆液性囊腺瘤介于良、恶性之间的肿瘤
慢性肥厚性鼻炎慢性单纯性鼻炎
老年女性,突发右上腹疼痛,向肩部放散,发热,寒战。查体:T39℃,巩膜黄染,心肺未见异常,右上腹肌紧张,压痛,反跳痛。最可能的诊断是
下列各项,表示HBV复制活跃的指标是
李某,72岁,1个月来粪便带血,消瘦,拟行直肠镜检查,应采用的卧位是
吴某想购买几幅珍贵的字帖送给自己喜欢集邮的叔父作为生日礼物,因对字帖不了解便找到书法爱好者赵某咨询,赵某告诉吴某“宋徽宗的瘦金体”比较珍贵,建议吴某买“宋徽宗的瘦金体”作为礼物。吴某便请赵某代为购买,赵某同意。赵某恰好有4幅“宋徽宗的瘦金体”,几日后,赵某
根据企业所得税法的规定,下列说法不正确的有()。
1/4由∫0xtsin(x2-t2)dt=-1/2∫0xsin(x2-t2)d(x2-t2)=1/2sinudu,得
由域名查询IP地址的过程分为递归查询和迭代查询两种,其中递归查询返回的结果为(17),而迭代查询返回的结果是(18)。(17)
【B1】【B5】
最新回复
(
0
)