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
44
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] 【B6】
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
approximately
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3012150.html
相关试题推荐
[originaltext]Overthepastdecade,theenvironmentalmovementhasexploded
[originaltext]Ourenvironmentisbeingpollutedfasterthannatureandman’
[originaltext]Ourenvironmentisbeingpollutedfasterthannatureandman’
[originaltext]Livingthingstakefromtheirenvironmentandgivebacktoth
[originaltext]Livingthingstakefromtheirenvironmentandgivebacktoth
[originaltext]Livingthingstakefromtheirenvironmentandgivebacktoth
[originaltext]Overthepastdecade,theenvironmentalmovementhasexploded
[originaltext]Overthepastdecade,theenvironmentalmovementhasexploded
[originaltext]Throughouthistorymanhaschangedhisphysicalenvironmentin
[originaltext]Throughouthistorymanhaschangedhisphysicalenvironmentin
随机试题
Coca-Colahasbeenoperatinginternationallyformostofits100yearhistory
[audioFiles]audio_eusm_0114(20106)[/audioFiles]A、Theywereallabovethirtyyea
[audioFiles]audio_eufm_j70_001(20082)[/audioFiles]A、Shedoesn’twanttomaketh
Iknowhefailedhislasttest,butreallyhe’s_______stupid.A、somethingbutB、a
Populationagingisatriumphofcivilization.Itisthe【C1】______consequenc
下列选项中,2013年工业增加值增长速度最快的行业是:() A.高端装备制
目前我国关于互联互通定价标准的规定,来自于()。A:《价格法》 B:《电信条例
关于工程网络计划工期优化的说法,正确的有()。A.应分析调整各项工作之间的逻辑关
某新建仓储工程,建筑面积8000m2,地下1层,地上1层,采用钢筋混凝土筏板基础
大肠癌的好发部位依次为A、直肠、乙状结肠、升结肠、横结肠、盲肠、降结肠 B、直
最新回复
(
0
)