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
90
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
B
解析
转载请注明原文地址:https://kaotiyun.com/show/56Td777K
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
Thechemicalisdeadlytoratsbutsafetocattle.
Thechemicalisdeadlytoratsbutsafetocattle.
Theuseofthechemicalmaypresentacertainhazardtothelaboratoryworkers.
Waterisakindofchemicalsubstance.
Waterisakindofchemicalsubstance.
Waterisakindofchemicalsubstance.
随机试题
临床疑诊脑出血时,首选的辅助检查是
下列各项中,不属于财政部门实施会计监督检查的内容是()。
下列关于民事诉讼简易程序和小额诉讼的表述,正确的有()。
在奴隶社会、封建社会中执行警察职能的机构与官吏,称为近代警察。()
求∫arcsin2xdx.
(70)是与IP协议同层的协议,可用于互联网上的路由器报告差错或提供有关意外情况的信息。
在考生文件夹下有一个工程文件sjt3.vbp。程序运行时,单击窗体则显示如图所示的图案。请去掉程序中的注释符,把程序中的?改为正确的内容。注意:不能修改程序的其他部分和控件属性。最后将修改后的文件按原文件名存盘。
Theproposalwas(endorsed)themajorityofmembers.
Whatisimportantwhen...?Planningcareerdevelopment-Furthertrainingcourses-Outlookofthefield-
A、Sheagreeswiththeman.B、Shedoesn’twanttogoout.C、Shewouldrathergoswimming.D、Shedoesn’tthinkitisafineday.C
最新回复
(
0
)