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
2024-06-10
33
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] 【B7】
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
structure
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3628417.html
相关试题推荐
Tous,theenvironmentinwhichfishdwelloftenseemscold,darkand【B1】___
Tous,theenvironmentinwhichfishdwelloftenseemscold,darkand【B1】___
Tous,theenvironmentinwhichfishdwelloftenseemscold,darkand【B1】___
Tous,theenvironmentinwhichfishdwelloftenseemscold,darkand【B1】___
WithChina’srapideconomicdevelopments,environmentaldamagehasbecomea
WithChina’srapideconomicdevelopments,environmentaldamagehasbecomea
WithChina’srapideconomicdevelopments,environmentaldamagehasbecomea
TheEnvironmentalProtectionAgencyhassetlimitsfortheradiationpermitt
TheEnvironmentalProtectionAgencyhassetlimitsfortheradiationpermitt
TheEnvironmentalProtectionAgencyhassetlimitsfortheradiationpermitt
随机试题
【B1】[br]【B9】long→longer本题考查逻辑关系。纵观上下文,这里讲的是在施以薰衣草香味以后,人们的逗留时间比以前长了,是为了对比而作的实验,
Howshouldaparentwithstrongpoliticalopinionstalktotheirchildabou
Brain-trainingsoftwaremaybeawasteoftime.Peoplewhoplayed"mind-boos
[originaltext]Whydidthemothersaythatshewouldn’tgivehimanythingtoeat
将俄国1805—1820年的历史过程记录下来的著名作品是()A.《人间喜剧》
台湾某著名音乐人士近日用“喂鸡”比喻当下音乐市场中唱片公司的做法,他说:“原本一
()是企业培训体系的三个子体系。A.培训管理体系 B.培训管理系统 C.培训
简述土耳其帝国的政治制度及其特点。
红斑的病理变化不包括A.上皮萎缩 B.原位癌 C.早期浸润癌 D.上皮异常
某农药动物实验的最大无作用剂量为10mg/(kg·bw),人和动物的种间差异为1
最新回复
(
0
)