首页
登录
职称英语
Cells cannot remain alive outside certain limits of temperature and much na
Cells cannot remain alive outside certain limits of temperature and much na
游客
2023-11-27
24
管理
问题
Cells cannot remain alive outside certain limits of
temperature and much narrower limits mark the boundaries of
effective functioning. Enzyme systems of mammals and birds are
most efficient only with a narrow range around 37℃; a departure【M1】______
of a few degrees from this value serious impairs their functioning.【M2】______
Even though cells can survive wider fluctuations the integrated
actions of bodily systems are impaired. Other animals have a wide【M3】______
tolerance for changes of bodily temperature.
For century it has been recognized that mammals and birds【M4】______
differ other animals in the way they regulate body temperature.【M5】______
Ways of characterizing the difference have become more accurate
and meaningful over time, but popular terminology still reflects an【M6】______
old division into " warm-blooded" and " cold-blooded" species;
warm-blooded included mammals and birds whereas all other
creatures were considered cold-blooded. As more species were
studied, it became evident that this classification was adequate. A【M7】______
cold-blooded fence lizard usually has a body temperature only a
degree or two below those of humans and so is not cold. Therefore【M8】______
the next distinction was taken between animals that maintain a【M9】______
constant body temperature, called homeotherms, and those whose
body temperature varies with their environments, called
poikilotherms. But this classification was also proved inadequate,【M10】______
because among mammals there are many that vary their body
temperatures during hibernation. Furthermore, many invertebrates
that live in the depths of the ocean never experience change in the
depths of the ocean, and their body temperatures remain constant. [br] 【M6】
选项
答案
an—the
解析
词汇错误。此处是特指过去对动物的一种划分方法,即把动物划分为暖血动物和冷血动物,故应用定冠词。
转载请注明原文地址:https://tihaiku.com/zcyy/3222435.html
相关试题推荐
Cellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchna
AnumberofyearsagoIsatdownonastonebenchoutsidetheTeatroAvenida
AnumberofyearsagoIsatdownonastonebenchoutsidetheTeatroAvenida
AnumberofyearsagoIsatdownonastonebenchoutsidetheTeatroAvenida
AnumberofyearsagoIsatdownonastonebenchoutsidetheTeatroAvenida
AnumberofyearsagoIsatdownonastonebenchoutsidetheTeatroAvenida
随机试题
DoSomethingtoImproveYourLifeWrongopin
Asaphysicianwhotravelsquiteabit,Ispendalotoftimeonplaneslist
[originaltext]M:Idon’tenjoydatinganymore.Ican’tseemtofindanyoneIha
Overthelasttwoyears,inthePCbusinessMichaelDellhasbeenbeatenlik
根据现行建筑安装工程费用项目组成规定,下列费用项目属于造价形成划分的是()。A
主“治节”的脏器是A.脾 B.心 C.肝 D.肺 E.肾
工程在正常使用条件下,最低保修期限为5年的是( )。 A、地基基础工程
按照投保动因分类,人身意外伤害保险的种类包括()。A.自愿意外伤害保险和强制意
运维班应定期检查安全工器具,做好检查记录(见附录Q),对发现不合格或超试验周期的
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
最新回复
(
0
)