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
2018-03-16
20
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 a-bout75%. 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、FALSE
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/HXWd777K
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
TheUnitedStateshashostedtheOlympicGamesarecordeighttimes.St.Louis,LosAngeles(twice)andAtlantahavebeenthesi
Butinpreservingthebalancewehavetobeclearwheretheproblemactuallylies.Ofthetotalcarbondioxideemissionscaused
Asinternationalcommercegrows,thereisanamazingdevelopmentwhichisexpandingatever-increasingrate—businessontheInte
Theworryaboutsaltisthatitmay(31)highbloodpressure.Chemically,salt(32)ofsodiumandchlorideions,bothof(33)ar
Theworryaboutsaltisthatitmay(31)highbloodpressure.Chemically,salt(32)ofsodiumandchlorideions,bothof(33)ar
Theworryaboutsaltisthatitmay(31)highbloodpressure.Chemically,salt(32)ofsodiumandchlorideions,bothof(33)ar
WorldleadersmetrecentlyatUnitedNationsheadquartersinNewYorkCitytodiscusstheenvironmentalissuesraisedattheRio
WorldleadersmetrecentlyatUnitedNationsheadquartersinNewYorkCitytodiscusstheenvironmentalissuesraisedattheRio
WorldleadersmetrecentlyatUnitedNationsheadquartersinNewYorkCitytodiscusstheenvironmentalissuesraisedattheRio
随机试题
曲拐:
仲裁庭的组成人员有下列哪些情形之一的,必须回避?
已知方阵A与方阵相似,则A的特征值为_______.
A.小动脉内皮细胞增生B.肾脏淀粉样变性C.肾小管酸中毒D.局灶节段坏死性肾小球肾炎系统性硬化病的主要肾脏病变为
A神经根型颈椎病B脊髓型颈椎病C椎动脉型颈椎病D交感神经型颈椎病E复合型颈椎病压头试验阳性体征见于
急性炎症早期局部浸润的炎细胞主要是
A.乙类非处方药B.处方药C.处方药、非处方药D.非处方药依照《处方药与非处方药流通管理暂行规定》取得准销标志的普通商业零售企业可以销售的药品是
根据《企业所得税法》的规定,不允许税前扣除的保险费是()。
2014年1月,王某拒不配合执勤民警李某对其进行身份核查,对李某辱骂、推搡、殴打,造成李某受伤(经鉴定构成轻伤二级),佩戴的眼镜也被摔坏。王某称事发前执勤民警要求检查其身份证,随后其与民警发生冲突。王某承认,被民警带去警务室的过程中,她用右手打了民警的脸,
A、Howtoprepareawedding.B、Theman’sweddingexperience.C、Thewoman’sadvicetotheman’swedding.D、Themaninvitedthe
最新回复
(
0
)