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
28
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
[originaltext]M:Ijustcan’tconcentratehereintheflat.Yousee,Arthur,I
Aneweraisuponus:theserviceeconomy,theinformationage,theknowledg
AccordingtoIanPearson,afuturologist,theseareamongthedevelopmentss
Manyteachersbelievethattheresponsibilitiesforlearningliewiththest
6Howcanone__________(袖手帝观)whenawomanisbeingattackedandrobbedinbroad
地下防水混凝土工程施工时,防水混凝土应注意的事项有()。 A、防水混凝土浇
某企业上年12月31日资产负债表部分项目的年初数和期末数如表7—4所示(单位:元
在场地总平面设计中,选择设计地面连接形式,要综合考虑的因素有( )。A.自然地
应该在国家指定的医学药学专业刊物上发布广告的药品是A.含麻黄碱类复方制剂(其中麻
可反映左右心房除极过程的是A、P波 B、QRS波群 C、T波 D、P-R间
最新回复
(
0
)