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
49
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、ThePhilippines.B、Brazil.C、Mexico.D、Guatemala.C细节题.由文章中“Studiesshowthatmorethanonemillionchildrenliveandworkon
Mostgrowingplantscontainmuchmorewaterthanallothermaterialscombined.C.R.Darneshassuggestedthatitisaspropert
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、Itsstrength.B、Itsheaviness.C、Itsdurability.D、Itscheapcost.AWhatwassteel’soutstandingfeature?
A、Somefriendsandrelativesthatshehadnotimetovisitbefore.B、Herclosestfriendsandrelativeswhowillmissher.C、The
A、Neitherofthetwotypesofrocketsisveryeconomical.B、Theliquid-fuelrocketisbest.C、Eachtypeofrockethascertainad
A、Theycontainnoexaggerationofrhetoric.B、Theyarefullofexplicitmorals.C、Theyforceustothink.D、Thelinesandsenten
Itisacommonplaceamongmoraliststhatyoucannotgethappinessbypursuingit.Thisisonlytrueifyoupursueit【62】.Gamble
Itisacommonplaceamongmoraliststhatyoucannotgethappinessbypursuingit.Thisisonlytrueifyoupursueit【62】.Gamble
随机试题
给定资料:1.周六一早,北京的徐女士在一家网站上浏览了二十分钟.为家人选购了两件商务衬衫和一双商务正装鞋。填写好家庭住址和送货的要求后,开始准备早餐、打扫房间,忙活起来。下午五点,网站专属的快递员准时地将用硬纸盒包装完好的货品交到徐女士的手上。徐
表面结构要求会影响配合的性质。
适合于消费品中的选购品和特殊品的分销渠道是()
血液不回流至门静脉的器官是()
蛋白质三级结构的形成和稳定主要靠的键或作用力不包括
泻下药的主治病证是()。
直径小于13mm的钢管和不锈钢管,宜采用()接头连接,也可采用承插法或套管法焊接。
下列事项中,可以引起所有者权益总额减少的有()。
假设记录指针指向第2条记录,执行下面命令不会移动记录指针的是()。
在考生文件夹下打开文档WORD.DOCX。【背景素材】为了更好地介绍公司的服务与市场战略,市场部助理小王需要协助制作完成公司战略规划文档,并调整文档的外观与格式。现在,请你按照如下需求,在Word.docx文档中完成制作工作:将Word.
最新回复
(
0
)