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
16
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、Its skeleton.
B、Its shape.
C、Its senses.
D、Its body temperature.
答案
B
解析
这段话里重点讨论了水的不可压缩性对鱼的影响,正是水的不可压缩性决定了鱼的外形进化,可见,说话者讨论最多的应该是鱼的外形。
转载请注明原文地址:https://tihaiku.com/zcyy/3560537.html
相关试题推荐
[originaltext]Allbigcitiesarequitesimilar.LivinginamodernAsianci
[originaltext]Scientistsarefascinatedbywhattheylearnfromthemethods
[originaltext]IntheUnitedStates,manypeopleoncelivedinlarge,twoan
[originaltext]IntheUnitedStates,manypeopleoncelivedinlarge,twoan
[originaltext]W:Whatonearthhashappenedtoyou?Youlookabsolutelywornou
[originaltext]W:Whatonearthhashappenedtoyou?Youlookabsolutelywornou
[originaltext]W:Hi,John.Howarethingsgoing?M:Oh,hi.Fine.Howaboutyo
[originaltext]W:Jack,wouldyouminddrivingmetothestation?M:Sure,why
[originaltext]W:Jack,wouldyouminddrivingmetothestation?M:Sure,why
[originaltext]W:Jack,wouldyouminddrivingmetothestation?M:Sure,why
随机试题
Itisnotsurprising,【C1】______thelackoffitbetweengiftedstudentsandtheir
BargainbookshoppersmusthavebeenpleasedlookingatAmazon’sbestseller
[originaltext]Aperson’ssocialprestigeseemstobedeterminedmainlybyh
土地权利的内容包括( )。A.占有 B.使用 C.收益 D.处分 E.
根据《2017届预算定额》,某工程土方项目,采用机械挖运湿土,相应项目人工系数为
关于无菌检查叙述错误的是A.此项检查属于无菌制剂的制剂通则检查 B.每批培养基
女性,45岁,偶然发现左乳房肿块,直径约2cm,质较硬、无压痛,与皮肤有少许粘连
诸葛亮27岁作《隆中对》,出为军师;基辛格从哈佛大学教授直接进入白宫成为美国的重
下列关于民事诉讼地域管辖的说法中,正确的有()。A.因侵权行为提起的诉讼,由
呼吸衰竭的血气诊断标准是A.动脉血氧含量低于9mmol/L B.动脉血氧饱和度
最新回复
(
0
)