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
34
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/HdxsFFFM
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
HeatIsKillerExtremelyhotweatheriscommoninmanypartsoftheworld.Althoughhotweatherjustmakesmostpeoplefeel
InthewesternUnitedStatesonecanstillfindpoststowhichnineteenth-centurycowboyshitchedtheirhorses.
ThelowesttemperaturethatmanhaseverknownwasrecordedinAntarctica.TheArcticandAntarcticaarenoman’slandsbecause
TheauthorofthepassagecouldnotgotosleeppartlybecauseWhatwastheweatherlikethatnight?.
Accordingtothepassage,whichofthefollowinghaschangedthemostinthelast500years?Whichofthefollowingstatements
TrafficinOurCitiesThevolumeoftrafficinmanycitiesintheworldtodaycontinuestoexpand.Thiscausesmanyproblems,
TrafficinOurCitiesThevolumeoftrafficinmanycitiesintheworldtodaycontinuestoexpand.Thiscausesmanyproblems,
Thestorywaspublishedwiththesolepurposeofsellingnewspapers
Practicallyallspeciesofanimalscommunicateeitherthroughsoundsorthroughalargerepertoryofsoundlesscodes.
A.todiscoversentencepatternsandgrammaticalrulesB.toexpandvocabularyC.tousethetargetlanguageD.toencourageunsucce
随机试题
从企业运营的角度来看,在生产控制中对供应商的控制属于()
向lmLpH=1.8的盐酸中加入水()才能使溶液的pH=2.8。
国际服务贸易发展的特征是
最有可能的诊断是此时应采取下列哪项检查
该壁柱墙的高厚比与下列______项数值接近。该山墙壁柱间墙的高厚比与下列______项数值接近。
无机结合料稳定类道路基层进入冬期施工,其特点和避害措施是()。
【背景资料】某施工单位在北方平原地区承建了一段长152km的双向四车道高速公路的路面工程,路面结构设计示意图如下:为保证工期,施工单位采用2台滑模摊铺机分左右幅同时组织面层施工,对行车道与硬路肩进行整体滑模摊铺。施工中发生如下事件:事件一:滑模摊铺前
描述企业是否具备应付特殊情况,满足始料末及的客户需求的能力的指标是______。
下列选项中,属于单务行为的是()
______wasconsideredtobethegreatestdramatistinthe18thcentury.
最新回复
(
0
)