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
36
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://jikaoti.com/ti/bdxsFFFM
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
StressLevelTiedtoEducationLevelPeoplewithlesseducationsufferfewerstressfuldays,accordingtoareportinthecu
SurveyFoundManyWomenMisinformedAboutCancerSixty-threepercentofAmericanwomenthinkthatifthere’snofamilyhist
SaveEnergyatHomeOntheaverage,Americanswasteasmuchenergyastwo-thirdsoftheworld’spopulationconsumes.That’s(1)
Mergethefollowingtwoshortsentencesintoonenewsentence.
Tohaveabetterunderstandingofapoem,oneshouldWhatdoesthelastsentenceinthethirdparagraphimply?
Thechemicalisdeadlytoratsbutsafetocattle.
Thechemicalisdeadlytoratsbutsafetocattle.
Thechemicalisdeadlytoratsbutsafetocattle.
Alllivingorganisms,regardlessoftheiruniqueidentity,havecertainlogical,chemical,andphysicalcharacteristicsincommo
随机试题
下列词句出自姜夔《暗香》(旧时月色)的是()
《先妣事略》采用的表达方式主要是()
自动冲洗照片中,与干燥不良的原因无关的是
患者,男,40岁。1年来皮肤常见青紫点,2天前饮酒后出现双下肢青紫斑块,心烦口渴,手足心热,盗汗,形体消瘦,舌红少苔,脉细数。治疗应首选
未经国务院期货监督管理机构审核并报国务院批准,期货交易所不得()。
某商品流通企业在第20个周期时,采用二次指数平滑法预测第25个周期的钢材销售量。已知a20=928.5,b20=280,则第25个周期的钢材预测销售量为()吨。
人力资源规划的含义包括()。
通过计算招聘过程中关键决策点的平均时间间隔来确定招聘时间的方法是()。[2008年真题]
阅读下文。回答96—100题。植物学家的最新系列研究表明,二氧化碳不只是改变气候,它还改变了植物的生理特性,并通过植物危害人类。为什么蔬菜、水果和粮食的产量越来越高,而这些食物的味道越来越淡?这与二氧化碳含量的升高有关,美国普林斯顿大学生物
根据现行《宪法》规定,关于公民权利和自由,下列选项表述正确的是()。
最新回复
(
0
)