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、A comparison between fish and warm-blooded animals. B、The difference between saltwater and freshwater environments. C、The impo
A、A comparison between fish and warm-blooded animals. B、The difference between saltwater and freshwater environments. C、The impo
admin
2013-10-14
65
问题
To us, the environment in which fish dwell often seems cold, dark and mysterious. But there are advantages of living in water.[1]And they’ve played an important role in making fish what they are.
One is that water isn’t subject to sudden temperature changes. Therefore it makes an excellent habitat for a cold-blooded animal. Another advantage is the water’s ability to easily support body weight.[2]Fish has approximately the same density as water. So a fish in water is almost weightless. This weightlessness in turn means two things: one is a fish can get along with a light weight and a simple bone structure; the other is limitations to a fish’s size are practically removed. Yet there’s one basic difficulty in living in water — the fact that it is incompressible. For a fish to move through water, it must actually shove water aside. Most can do this by wiggling back and forth in snake-like motion. The fish pushes water aside by the forward motion of its head and with a curve of its body and its flexible tail. Next the water flows back along the fish’s narrowing size, closing in at the tail and helping the fish propel itself forward.
The fact that water is incompressible has literally shaped the development of fish. A flat and angular shape can be moved through water only with difficulty. And for this reason, fish have a basic shape that is beautifully adapted to deal with this peculiarity.
1. What is the passage mainly about?
2.What does fish have in common with water, according to the passage?
3. What shaped the development of fish?
选项
A、A comparison between fish and warm-blooded animals.
B、The difference between saltwater and freshwater environments.
C、The importance of fish to human beings.
D、The influence of water on the development of fish.
答案
D
解析
主旨题。短文开头处提到,鱼生活在水中有很多优势,水在鱼的进化中发挥了重要作用,之后又围绕着水对鱼的进化的影响展开论述,由此可知短文主要是关于水对鱼的进化的影响,故答案为[D]。
转载请注明原文地址:https://kaotiyun.com/show/gV27777K
0
大学英语六级
相关试题推荐
A、Sheshouldpresenthimabookonmusic.B、Theteacherhassomeinterestsotherthanreading.C、It’sagoodideabecausethete
A、First-bornchildren.B、Theyoungestchildren.C、Theneglectedchildren.D、Laterbornchildren.A事实细节题。短文介绍说,研究发现排行老大的孩子在数学和语言能
A、Callataxiforthewoman.B、Rideahorsewiththewoman.C、Takethewomantothebusstation.D、Drivethewomantothetrain
Mountainclimbingisbecomingapopularsport,butitisalsoa【B1】_____dangerousone.Peoplecanfall;theymayalsobecomeil
A、Explainbowpresent-dayreadinghabitsdeveloped.B、Changepeople’sattitudestoreading.C、Showhowreadingmethodshavebeen
A、Asksomeoneelsetohelpthewoman.B、Askthewomanfordirections.C、Showthewomanthemap.D、Showthewomanwherethedormi
A、It’shelpfultohispersonaldevelopment.B、It’sawayofshowinghisrespecttotheNBA.C、It’ssomethingheshoulddoforhi
A、TheircompetitorshavelongbeenadvertisingonTV.B、TVcommercialsarelessexpensive.C、Advertisinginnewspapersaloneis
A、Thewomanisentirelywrong.B、Heisdoubtfulaboutit.C、Thedecisionshouldbemadeassoonaspossible.D、Heapprovesofit
A、Acceptafull-timejob.B、GotomeetLauraattherestaurant.C、GooutoftownwithLaura.D、SubstituteforLauraatwork.D综合
随机试题
视远物和近物都需要眼进行调节的折光异常是()(2007年)
患者,女,22岁。月经提前8天,量多、色淡、质稀,神疲,肢软,小腹空坠,纳少便溏,舌淡苔薄,脉缓弱。其诊断是
A.特殊管理制度B.中药品种保护制度C.分类管理制度D.药品储备制度根据《中华人民共和国药品管理法》国家对处方药和非处方药实行()。
通常用于公路接缝,密封性能较好的密封材料是()。
施工单位应当为施工现场的人员办理意外伤害保险。意外伤害保险费应由()支付。
混凝土立方体抗压强度是由混凝土立方体试块测得的。关于龄期和保证率,下列表述正确的是()。
根据国家统一的会计制度规定单位对外提供的账务会计报告应当由单位有关人员签字并盖章,下列各项中不需要在单位对外提供的财务报告上签字并盖章的人()。
票据的取得以无偿或不以相当对价的,票据取得人不享有票据权利。()(2012年上半年)
分组教学是班级授课制的一种改良,它的类型包括能力分组和()。
下列表述中,体现“和谐”哲学思想的有()。
最新回复
(
0
)