首页
登录
职称英语
[originaltext] To us, the environment in which fish dwell often seems cold,
[originaltext] To us, the environment in which fish dwell often seems cold,
游客
2024-04-18
28
管理
问题
To us, the environment in which fish dwell often seems cold, dark, and mysterious. But there are advantages to living in water, and they have 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. Protoplasm has approximately the same density as water, so a fish in water is almost weightless. This "weightlessness"in turn means two things:One, a fish can get along with a light weigh and simple bone structure, and two, limitations to a fish’s size are practically removed.
Yet there is one basic difficulty to living in water—the fact that it’s incompressible. For a fish to move through water, it must actually shove it aside. Most can do this by wiggling back and forth in snakelike motion. The fish pushes water aside by the forward motion of its head, and with the curve of its body and its flexible tail. Next, the water flows back along the fish’s narrowing sides, 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.
10. What is the talk mainly about?
11. What does the speaker mention as a problem that water presents to fish?
12. The speaker compares a fish’s movement with that of what creature?
13. What aspect of a fish does the speaker discuss in the most detail?
选项
A、A whale.
B、A human.
C、A snake.
D、A snail.
答案
C
解析
这是一道细节题。“snakelike”意思是“像蛇一样的”。可见,说话者是在把鱼的动作与蛇的动作进行比较。
转载请注明原文地址:https://tihaiku.com/zcyy/3560536.html
相关试题推荐
[originaltext]WhenMidoriwastwoyearsold,sheoftenclimbedontothepia
[originaltext]WhenMidoriwastwoyearsold,sheoftenclimbedontothepia
[originaltext]Theprivatemotorvehiclehasgivenusafreedomourancestor
[originaltext]ForaverylongtimeAmericahasledtheworldinhighereduc
[originaltext]W:2millionhighschoolseniorsaregearingupthisfalltoapply
[originaltext]W:2millionhighschoolseniorsaregearingupthisfalltoapply
[originaltext]W:2millionhighschoolseniorsaregearingupthisfalltoapply
[originaltext]W:Whatareyouscratchingyourheadfor?M:I’vebeenrackingmyb
[originaltext]W:Whatareyouscratchingyourheadfor?M:I’vebeenrackingmyb
[originaltext]W:Whatareyouscratchingyourheadfor?M:I’vebeenrackingmyb
随机试题
______thesenseofsomeonewatchinghim,Joeywouldtakeashowerrightnowint
[originaltext]Oldagemaynotsoundexciting.Butrecentfindingsoffergoo
有毒物质进入人体内并累积到一定量时,便会扰乱或破坏机体的正常生理功能。引起暂时性
建设单位决定采用哪种合同形式,通常根据( )因素综合考虑。 A、设计工作深度
一冷杉方木压弯构件,承受压力设计值N=50×10^3N,弯矩设计值M=2.5×1
对中华民族道德传统进行批判地继承的标准是( ) A.是否有利于推动中国特色社
文化生态指的是各地区各民族自然而然的、原生性的、祖先传下来的文化生活,这个文化生
注:(1)未列出的省(区、市)没有早稻生产; (2)华南地区专指广东、广西
根据《建设工程质量管理条例》,隐蔽工程在隐蔽前,施工单位应当通知()A、建设单位
根据《标准施工招标文件》,变更的范围和内容包括()。A.改变合同中任何一项工作的
最新回复
(
0
)