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
39
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] 【C13】
选项
A、warm
B、constant
C、stable
D、cold
答案
B
解析
本句讲到人们进一步把动物分为两类,根据本句的关键词varied可知本空需要一个与之意思相反的词来显示动物类别不同。故答案缩小于选项B和C之间,而46题所在句的constant一词有助于排除选项C,故选项B正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3189752.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
Ifyou’reinaWesterncountry,you’lloftenseepeople【T1】________theirdog
Bodylanguagereferstoexpressionsandbodymovements.Itisanimportantw
HeatDamagesColombiaCoffee,RaisingPricesLikemostofth
Everylivingthinghaswhatscientistscallabiologicalclockthatcontrols
A、Forwecancreatenewrobotsinthefuture.B、Forwecanadaptourskillstot
项目管理方法的核心是风险管理与()相结合。A.目标管理 B.质量管理 C
《萨班斯——奥克斯利法案》第302条款规定了公司对财务报告的责任,要求对于按照1
提出人格基本维度以及人格结构层次理论的心理学家是()。A.奥尔波特 B.
下列物质中,能够在底物水平上生成GTP的是( )。A.乙酰CoA B.琥珀酰
下列关于道路交通标志的说法,正确的有()。A.主标志应包括警告、禁令、指示及指
最新回复
(
0
)