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
A、Maintain a certain amount of salt in their body. B、Absorb enough water into their body. C、Keep a higher concentration of salt.
A、Maintain a certain amount of salt in their body. B、Absorb enough water into their body. C、Keep a higher concentration of salt.
admin
2013-02-17
100
问题
Fish live in water, but do they drink it? The answer is yes, but how fish drink water depends on where they live. Water gets into a fish’s body through a process in which water diffuses from a higher to a lower concentration. For example, if there is more water outside of a cell than inside, water will try to flow into the cell until there is the same concentration of water both outside and inside. The body of a fish acts the same way, either absorbing or losing water depending on its surroundings.Whether a fish absorbs or loses water is based on the fact that all fish must maintain a certain amount of salt in their bodies to stay healthy. Fish that live in fresh water have a higher concentration of salt in their bodies than the surrounding water. Consequently, water continuously flows into the fish’s body to attempt to dilute the amount of salt in the fish until it is equal to the amount of salt in the surrounding water. Since fish cannot allow their salt content to be diminished, their kidneys work overtime to expel excess water. Ocean fish have the opposite problem. Surrounded by salt water, their bodies contain a relatively lower concentration of salt than the ocean water. In this case it causes the fish to constantly lose water in order to equalize salt concentration inside and outside the body to partly compensate for the water loss, ocean fish actually drink water through their mouths. And to get rid of the excess salt they take in by drinking seawater, they also get some salt off their body.
8.What does the speaker say determines how fish drink water?
9.What do fish do to stay healthy?
10.Why do fish in fresh water make their kidneys work overtime?
选项
A、Maintain a certain amount of salt in their body.
B、Absorb enough water into their body.
C、Keep a higher concentration of salt.
D、Find a new place to live in.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/hyI7777K
0
大学英语六级
相关试题推荐
Auto-Tune:WhyPopMusicSoundsPerfectIfyouhaven’tbeenlisteningtopopradiointhepastfewmonths,you’vemissedthe
A、5:15.B、4:45.C、0.239583D、0.177083B根据对话中提到的JackandIalwaysgetupataboutaquartertofive可知,女士每天早上4:45起床,故答案为[B]。
What’stherightactivityforme?Whoeveryouare,there’sanactivityforyoutomaintaina"keepfit"lifestyle.Andjust
A、Helistenedtosomeseriousmusic.B、Heboughtastereosystem.C、Hegothisspeakersfixed.D、Hewentshoppingwiththewoman
ThevolcaniceruptionsinIceland,seismic(地震的)devastationinSamoa,Sumatra,HaitiandChile.Allwithinsixmonths.Thepubl
A、Itisbasedonresearchesfrombothschoolsandworkplace.B、Itliststhingsthathelpkidsnowandinthefuture.C、Itisabo
A、Askhisprofessortowritearecommendationletter.B、Providetheschoolhisscores.C、Buildstrongself-confidence.D、Takea
Thedoctorwarnedhimto______hisworkloadifhewantedtomaintainhealth.
Therichhavetraditionallypassedtheirwealthontotheirchildren.Butanincreasingnumberofbillionairesarechoosingnot
TheTajMahalistoopenonmoonlitevenings20yearsaftersecurityfearsendednightvisits.India’sSupremeCourtwillallow
随机试题
机械通气时表示通气恰当的呼气末CO2浓度为()。
葛根最适宜应用于牛蒡子最适宜应用于
建筑给水系统设有水箱时,水泵的扬程设置应()。
统率教师职业道德评价全过程的是()、主题性原则和质的分析原则。
法的本质最初表现为法的()。
在经典测量的真分数模型下,公式SX2=SI2+SV2+SE2中的SI2是()
截至2009年年末,中国内地的外汇储备余额为23992亿美元,占同期世界外汇筹备总额90075亿美元的26.6%。根据国家外管局统计,2008年中国内地的国际投资净头寸达到18219亿美元,中国跃升为全球最为重要的债权国。据此数据,你认为中国内地外
“七艺”
研究表明,很少服用抗生素的人比经常服用抗生素的人有更强的免疫力。然而,没有证据表明,服用抗生素会削弱免疫力。以下哪项如果为真,最能解释题干中似乎存在的不一致?
Readthecommentsbelowfortheco-CEOmodel.Aresentences16-22ontheoppositepage’Right’or’Wrong’?Ifthereisnot
最新回复
(
0
)