首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Cells cannot remain alive outside certain limits of temperature, and much narrower limits mark the boundaries of effective funct
Cells cannot remain alive outside certain limits of temperature, and much narrower limits mark the boundaries of effective funct
admin
2012-07-22
50
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】______ .
【C8】
选项
A、however
B、whereas
C、with
D、though
答案
B
解析
此句讲到恒温动物包括哺乳动物和鸟类,______其他的动物被认为是冷血动物。明显这是两类动物的对比,表转折的连词可起到连接作用,故whereas符合题意。
转载请注明原文地址:https://kaotiyun.com/show/OlmK777K
0
专业英语四级
相关试题推荐
______muchisknownaboutwhatoccursduringsleep,theprecisefunctionofsleepanditsdifferentstagesremainslargelyint
Thecountyisasubdivisionofthestateusually-butnotalways-containingtwoormoretownshipsandseveralvillages.NewYork
Whatdothespeakersmainlydiscuss?
Somepeoplebelievethatinternationalsportcreatesgoodwillbetweenthenations.Theythinkthatifcountriesplaygamestoget
Goingoncomputermaybethetoughestjobaremodelingcontractoreverdoes.Inordertomakeaconversionwithinayear,acomp
Fromchildhoodtooldage,wealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.When.
"Iwasalways______tospeakbytheleadersatacriticalmoment,"Mr.Verlocdeclared,withobvioussatisfaction.
Whywasthespeedlimitfirstreducedto55miles-per-hour?
Weneedtocompletetheconstruction______istwomilliondollars.
Peoplefromallwalksoflifetookpartinthedemonstration.Theunderlinedpartmeans______.
随机试题
电气设备发生火灾时,首先要采取相应措施灭火,再切断电源。()
热力学第一定律和第二定律表明的是隔离体系能量守衡定律和隔离体系过程方向和限度。
应美国总统奥巴马的邀请,法国总统奥朗德于当地时间2月10日至12日对美国进行为期3天的国事访问,这是_______以来法国总统对美国进行的首次国事访问。()
A.炉甘石洗剂B.锡类散C.苏打水D.氧化锌软膏E.硼酸软膏化疗病人出现口腔溃疡时采用
硝酸酯类舒张血管的机制是
下列哪项不属生殖轴的范围( )。
2010年11月13日,某双苯厂硝基苯精馏塔发生爆炸,造成8人死亡,60人受伤,直接经济损失6908万元,并引发松花江水污染事件。国务院事故及事件调查组认定,中石油吉林石化分公司双苯厂“11.13”,爆炸事故和松花江水污染事件是一起特大生产安全责任事故和特
甲注册会计师负责A公司2009年度财务报表审计工作,遇到了分析程序相关问题,请代为作出正确的判断。分析程序可以用作风险评估程序,以了解被审计单位及其环境,以下关于用作风险评估程序中的分析程序说法正确的是()。
《国家中长期教育改革和发展规划纲要(2010--2020年)》提出到2020年关于学前教育的发展目标不包括()。
有以下程序voidf(intx,inty){intt,if(x<y){t=x;x=y;t;}}main(){inta=4,b=3,c=5;f(a,B);f(a,C);f(b,C);cout<<a<<"
最新回复
(
0
)