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
54
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
PASSAGETHREE[br]Accordingtothepassage,whatendowstheEnglishparkscener
ThingstoKnowabouttheU.K.FromBuckinghamPalac
下列选项中,哪些是银行公司治理组织架构的主体?()A.股东大会 B.董事
关于输卵管妊娠,下列说法哪项是错误的A.以壶腹部多见 B.峡部妊娠比壶腹部妊娠
教师专业发展的基础是()。A.终身学习 B.教研结合 C.创新实践
功能助阳益阴,兼可固涩下焦的药是( ) A.补骨脂 B.菟丝子 C.益智
简述智力技能形成的特征?
A
公司出现解散事由,应按规定进行清算。下列关于清算组活动规则的说法中,符合《公司法
根据《环境影响评价公众参与办法》,建设单位应当在确定环境影响报告书编制单位后7
最新回复
(
0
)