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
4
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://www.tihaiku.com/zcyy/3560535.html
相关试题推荐
[originaltext]W:DidwehaveanyhomeworkassignedforFriday?Ididn’ttakean
[originaltext]Themodernsailingshipwasdevelopedbyamanwhoneverwent
[originaltext]SomestudentsattheOpenUniversityleftschool20yearsago
[originaltext]SomestudentsattheOpenUniversityleftschool20yearsago
[originaltext]SomestudentsattheOpenUniversityleftschool20yearsago
[originaltext]Hello,IamHaroldSmith.AstheeditoroftheVoice,I’dlik
[originaltext]M:Youlikelivinginthecity,don’tyou?W:Oh,Iloveit.It’s
[originaltext]M:Youlikelivinginthecity,don’tyou?W:Oh,Iloveit.It’s
[originaltext]M:Youlikelivinginthecity,don’tyou?W:Oh,Iloveit.It’s
[originaltext]W:Hey!Areyougoingtoplaysometennisthisafternoon?M:Well
随机试题
Womenarequiteoftencompetentdrivers,buttheyareveryseldomconsisten
患者,女性,33岁,停经8个月,第一胎,阴道大量流血3小时入院。出血时不伴有腹痛
下列具有甾体母核的利尿药是A.呋塞米 B.依他尼酸 C.氨苯蝶啶 D.氢氯
完整的互动营销需要具备的组成部分有( )。A.目标顾客的精准定位 B.重视开
生产商品的劳动.作为人类劳动力在生理学意义上的耗费,是( ) A.具体劳动
心与肾的关系主要表现在A.消化方面 B.阴阳相互依存方面 C.血液运行方面
小型企业人力资源管理部门的设置特点之一是()。A:往往设置招聘、培训和开发、薪酬
根据专利法律制度的规定,关于下列成果是否可以被授予专利权,说法不正确的有()。A
根据《标准施工合同》,投保工程一切险的保险金额不足以赔偿实际损失时,差额部分应由
下列关于电梯井的防护措施中,说法正确的是()。A.电梯井首层应设置一层水平安
最新回复
(
0
)