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、They lose water constantly. B、They contain a relatively lower concentration of salt. C、They neither lose nor absorb water. D、T
A、They lose water constantly. B、They contain a relatively lower concentration of salt. C、They neither lose nor absorb water. D、T
admin
2013-06-02
88
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 osmosis. Take a cell as an 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 on either side of the cell’s membrane. The body of a fish acts the same way, (33) 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. (34) 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.
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 osmosis causes the fish to constantly lose water in order to equalize salt concentration inside and outside the fish. To partially compensate for the water loss, ocean fish actually drink water through their mouths. And (35) to get rid of the excess salt they take in by drinking seawater, they excrete some salt through cells in their gills.
选项
A、They lose water constantly.
B、They contain a relatively lower concentration of salt.
C、They neither lose nor absorb water.
D、They possess a relatively higher concentration of salt.
答案
D
解析
根据原文,咸水鱼体内的盐分低于周围的水环境,而淡水鱼体内的盐分相对高于其周围的水环境,故选D项。
转载请注明原文地址:https://kaotiyun.com/show/N167777K
0
大学英语六级
相关试题推荐
A、Whenhuntingforfood.B、Whensleeping.C、Whenbeingattacked.D、Whencommunicatingwiththeircousins.A细节辨别题文章第三段第一句介绍了有些海洋
Directions:Forthispart,youareallowed30minutestowriteacompositiononthetopic:AbilityandGoodLooks.Youshouldwr
A、Governmentfunded.B、Political.C、Private.D、Noneoftheabove.C细节题。由文章中“Theprivateorganizationknownas“ChildHopeU.S.
A、Photocopyservice.B、Enlarger.C、Computerservice.D、Typewriter.C文章的最后提到图书馆提供复印机、放大复印机、缩微胶卷播放器、打印机等设备,但没有提到电脑设备,故选C项。
A、Neitherofthetwotypesofrocketsisveryeconomical.B、Theliquid-fuelrocketisbest.C、Eachtypeofrockethascertainad
A、Wordsandphrases.B、Culture.C、Individuals.D、Misunderstanding.B信息明示题。由文章中的becausebodylanguageisverymuchtiedtocultur
A、Theycontainnoexaggerationofrhetoric.B、Theyarefullofexplicitmorals.C、Theyforceustothink.D、Thelinesandsenten
Itisacommonplaceamongmoraliststhatyoucannotgethappinessbypursuingit.Thisisonlytrueifyoupursueit【62】.Gamble
随机试题
下官此来,并非擅造潭府。
龈沟液的作用不包括()
下列有关护理诊断排序原则的描述,正确的是
建设工程总概算中的单项工程综合概算可分为( )。
挖土(方)路基及填土(方)路基基底均应进行压实。其路基压实要求包括()。
设置会计工作岗位,一般可以()。
随机抽取25个网络用户,得到他们的年龄数据如表2—21所示。要求:(1)计算众数、中位数;(2)计算平均数和标准差;(3)计算偏态系数和峰态系数;(4)对网民年龄的分布特征进行综合分析。[南京大学2009研]
Whohasn’twantedtomasternotjusttwolanguagesbut10?TakeGiuseppeMezzofanti,a19th-centurypriestwhowassaidtobe【C1
Writeanessaybasedonthedrawing.Inyourwriting,youshould1)describethedrawingbriefly,2)explainitsintende
InourstudyofEnglish______isnecessarytopractisespeakingandlistening.
最新回复
(
0
)