首页
登录
职称英语
Cells cannot remain alive outside certain limits of temperature, and much n
Cells cannot remain alive outside certain limits of temperature, and much n
游客
2023-11-15
32
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 within a narrow 【C1】______ around 37℃; a 【C2】______ , of a few degrees from this value seriously impairs their functioning. Even though cells can survive wider 【C3】______ , the integrated actions of bodily systems are impaired. Other animals have a wider tolerance 【C4】______ changes of bodily temperature.
For centuries 【C5】______ has been recognized that mammals and birds differ from other animals in the way they regulate body temperature. Ways of 【C6】______ the difference have become more accurate and meaningful over time, but popular terminology still reflects the old division 【C7】______ " warm blooded" and "cold blood- ed " species; warm blooded included mammals and birds, 【C8】______ all other creatures were considered cold blooded. 【C9】______ more species were studied, it became evident that this classification was 【C10】______ A fence lizard usually has a body temperature only a degree or two below 【C11】______ of humans and so is not cold. 【C12】______ the next distinction was made between animals that maintain a 【C13】______ body temperature and those whose body temperature varies with their environment. But this classification also proved inadequate, 【C14】______ among mammals there are many that vary their body temperatures during hibernation. 【C15】______ many invertebrates that live in the 【C16】______ of the ocean never experience a change in the chill of the deep water, and their body temperatures remain constant. The current distinction is between animals whose body temperature is 【C17】______ chiefly by internal metabolic processes and those whose temperature is regulated by the 【C18】______ . The latter do so mainly by moving to favorable sites or by changing their exposure to 【C19】______ sources of heat. Mammals and birds also regulate their temperature by choosing favorable environments, but primarily they regulate their temperature by making a variety of internal 【C20】______ . [br] 【C5】
选项
A、they
B、it
C、we
D、what
答案
B
解析
it作形式主语。
转载请注明原文地址:https://tihaiku.com/zcyy/3189744.html
相关试题推荐
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
Certainlynocreatureintheseais【C1】______thanthecommonseacucumber.A
随机试题
Irememberherface,butIcan’t______whereImether.[originaltext]动词词义辨析[/o
【B1】[br]【B3】A、upB、toC、inD、onB词义辨析题。根据句意以及动词add的提示,应该选择to为该题答案。add材to的意思是“增
简述制定出版物组合要依据的因素。
函数y=2sinxcosx的最小正周期是()
经产妇,宫口开大4cm,破水后产妇突然烦躁不安,诉头晕、胸闷,测心率124次/分
工业炉的中心线和主要标高控制线应按()测量确定。A、设计要求 B、工业炉进
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
以下是某年全国资金流量表部分资料: 请根据以上资料进行计算和分析判断,在
集体合同的形式可以分为( )。A.主件 B.附件 C.目录 D.正文
最新回复
(
0
)