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
2023-08-21
47
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、It can’t be compressed.
B、It is often polluted.
C、Its temperature often fluctuates dramatically.
D、It limits their size.
答案
A
解析
说话者提到,生活在水里的一个基本困难在于水是不可压缩的(incom-pressible),正确答案应该是A。
转载请注明原文地址:https://tihaiku.com/zcyy/2944271.html
相关试题推荐
TheTruthabouttheEnvironmentA)Formanyenvironmentalists
TheTruthabouttheEnvironmentA)Formanyenvironmentalists
TheTruthabouttheEnvironmentA)Formanyenvironmentalists
TheTruthabouttheEnvironmentA)Formanyenvironmentalists
TheTruthabouttheEnvironmentA)Formanyenvironmentalists
TheTruthabouttheEnvironmentA)Formanyenvironmentalists
"Theworld’senvironmentissurprisinglyhealthy.Discuss."Ifthatwerean
"Theworld’senvironmentissurprisinglyhealthy.Discuss."Ifthatwerean
"Theworld’senvironmentissurprisinglyhealthy.Discuss."Ifthatwerean
[originaltext]InBritainthebiggestnumberofworkingforeignerscomesfro
随机试题
AustralianminingentrepreneurClivePalmeronTuesdayunveiledblueprintsf
Schlesingerhasrecentlyassumedaconciliatoryattitudethatisnot(i)______b
Mostworthwhilecareersrequiresomekindofspecializedtraining.Ideally,
Trytoimaginewhatitisliketolivewithoutelectricity.Itisboring,【C1
设随机变量X的概率密度函数为φ(x),且已知φ(-x)=φ(x),F(x)为X的
婴儿佝偻病的主要病因是A:饮食中缺磷 B:甲状旁腺功能低下 C:缺乏维生素C
这一时期德、日等国走上了法西斯主义集权统治道路,其主要原因是()A.国内严重的危
呋塞米与抗组胺药合用时A.耳毒性增加 B.引起电解质紊乱的概率增加 C.利尿
根据《规划环境影响评价技术导则—总纲》,规划环境影响报告书主要内容可不包括(
某大型引调水工程施工投标最高限价8亿元,主要工程内容包括水闸、渠道及管理设施等,
最新回复
(
0
)