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
2025-04-06
8
管理
问题
Cells cannot remain alive outside certain limits of temperature, and much narrower limits mark the bound-aries 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 body 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 blooded" 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] 【C8】
选项
A、however
B、whereas
C、with
D、though
答案
B
解析
逻辑关系。前句讲到恒温动物,后句提到其他的动物被认为是冷血动物。明显这是两类动物的对比,选项中,表转折的连词whereas可起到连接作用。故答案为B。
转载请注明原文地址:https://tihaiku.com/zcyy/4029401.html
相关试题推荐
HisaccountofhisexperienceinAntarcticcannotbedismissedas______.A、unfair
______youcannotpickmeupattheairport,pleasecallmeimmediately.A、Inorde
Cellscannotremainaliveoutsidecertainlimitsoftemperature,andmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperature,andmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperature,andmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperature,andmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperature,andmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperature,andmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperature,andmuchna
Cellscannotremainaliveoutsidecertainlimitsoftemperature,andmuchna
随机试题
Developmentbanksareinternationallendinggroups.Theylendmoneytodevelopin
Beforethe1850’s,theUnitedStateshadanumberofsmallcolleges,mostofthe
WELLTIPHEALTHPLAN,INC.
银行存款日记账的收入方除了根据银行存款收款凭证登记外,有时还要根据()。A.银行
阅读下列说明,回答问题1至问题3,将解答填入答题纸的对应栏内。 【说明】 某
广西位于中国南部邻云南、贵州、江西、湖南和广东。
WHO认为,一个有代表性的社区,其社区面积大约在A.100~200km B.5
共用题干 AgingThroughouthistorymanhasha
甲、乙约定:甲将100吨汽油卖给乙,合同签订后三天交货,交货后十天内付货款。
超前锚杆、小导管支护必须与()配合使用。A.临时仰拱 B.地表锚杆 C.管
最新回复
(
0
)