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
2024-11-08
13
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/3836995.html
相关试题推荐
ApplicationsoutsidetheEarth’satmosphereareclearlyagoodfitforrob
ApplicationsoutsidetheEarth’satmosphereareclearlyagoodfitforrob
ApplicationsoutsidetheEarth’satmosphereareclearlyagoodfitforrob
ApplicationsoutsidetheEarth’satmosphereareclearlyagoodfitforrob
Cellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperatureandmuchna
随机试题
______moreattention,thekidcouldhavedonebetter.A、TogiveB、HavinggivenC、
[originaltext]Clerk:Goodmorning,Mr.Bob.WhatcanIdoforyou?Bob:Iwant
[originaltext]IworkinadvertisingandIliketokeepupwithcurrenttrends,
Arapidmeansoflong-distancetransportationbecameanecessityforthe
Drunkendrivinghasbecomeanational【C1】______.Everyhourofeveryday
急性食管炎时黏膜鳞状上皮和固有膜内主要的浸润细胞是:()A.淋巴细胞 B.
房产税是以房屋为征收对象,按房屋的计税余值或租金收入为计税依据,向产权所有人征收
TGARCH模型是在GARCH模型的基础之上增加一个虚拟变量I。( )
A.影响小气候和太阳辐射 B.产生温室效应 C.臭氧层破坏 D.形成酸雨
为防止锅炉炉膛爆炸,对燃油、燃气和煤粉锅炉,正确的点火程序是()A:点火→送风→
最新回复
(
0
)