首页
登录
职称英语
To us, the environment in which fish dwell often seems cold, dark and【B1】___
To us, the environment in which fish dwell often seems cold, dark and【B1】___
游客
2023-09-14
41
管理
问题
To us, the environment in which fish dwell often seems cold, dark and【B1】______ .But there are advantages to【B2】______ water. And【B3】______ played an important role in making fish what they are. One is that water isn’t【B4】______ sudden temperature changes. Therefore it makes【B5】______ habitat for a cold-blooded animal. Another advantage is the water’ s ability to easily support body weight. Protoplasm has【B6】______ the same density as water. So fish in water is almost weightless. This weightlessness in turn means two things: 1) Fish can get along with a light weight and a simple bone【B7】______ . And 2) Limitations to a【B8】______ size are practically removed. Yet there is one basic difficulty to live in water in fact that it is incompressible.【B9】_______________________ The fish pushes water aside by the forward motion of its head and with a curve of its body and its flexible tail.
【B10】______________________ . 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.【B11】______________________________ . [br] 【B10】
鱼在水中运动的原理
To us, the environment in which fish dwell often seems cold, dark and (36) mysterious. But there are advantages to (37) live in water. And (38) they’ye played an important role in making fish what they are. One is that water isn’t (39) subject to sudden temperature changes. These fore it makes (40) an excellent habitat for a cold-blooded animal. Another advantage is the water’s ability to easily support body weight. Protoplasm has (41) approximately the same density as water. So fish in water are almost weightless. This weightlessness in turn means two things: 1) Fish can get along with a light weight and a simple bone (42) structure. And 2) Limitations to a (43) fish’s size are practically removed. Yet there is one basic difficulty to live in water-- the fact that it is incompressible. (44) For a fish to move through water, it must actually shove it aside. Most can do this by wiggling back and forth in a snakelike motion. The fish pushes water aside by the forward motion of its head and with a curve of its body and its flexible tail.
(45) Next the water flows back along the fish’s narrowing side, 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 fiat and angular shape can be moved through water only with difficulty. (46) And for this reason, fish have a basic shape that is beautifully adapted to deal with this peculiarity.
选项
答案
Next the water flows back along the fish’s narrowing size, closing in at the tail and helping the fish propel itself forward.
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3012154.html
相关试题推荐
[originaltext]Overthepastdecade,theenvironmentalmovementhasexploded
[originaltext]Overthepastdecade,theenvironmentalmovementhasexploded
[originaltext]Overthepastdecade,theenvironmentalmovementhasexploded
[originaltext]Throughouthistorymanhaschangedhisphysicalenvironmentin
[originaltext]Throughouthistorymanhaschangedhisphysicalenvironmentin
[originaltext]AnenvironmentalgroupcalledtheFoodCommissionisunhappya
[originaltext]Ourenvironmentisbeingpollutedfasterthanthenatureandm
[originaltext]Ourenvironmentisbeingpollutedfasterthanthenatureandm
[originaltext]Livingthingstakefromtheirenvironmentandgivebacktothe
[originaltext]Livingthingstakefromtheirenvironmentandgivebacktothe
随机试题
LAG:A、appeardifficultB、altersignificantlyC、dartsimplyD、gazeaboutE、movef
______(受到文化冲击的人们)oftenexhibitoneormoreofthefollowingtypesofbehavior.P
[originaltext]Abitofrainandwindinsummercanbenice.Butbadstorms
MorehasbeenlearnedabouttheMoonthananyotheroftheEarth’sneighborsin
HowmanypeoplediedintherecentconflictbetweenIraqipeopleandtheU.S.-
影响咀嚼效率最主要的因素是A.性别 B.年龄 C.牙的功能性接触面积 D.
地下水位下降,土中有效自重应力发生的变化是( )。A.原水位以上不变,原水位以
1966年下半年至1971年,是城市建设()的时期。A.开始复兴的时期
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
依据《中华人民共和国海洋环境保护法》,下列说法中,符合海岸工程建设项目对海洋环境
最新回复
(
0
)