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
38
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】______ .
【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://kaotiyun.com/show/almK777K
0
专业英语四级
相关试题推荐
Accordingtothenews,whichofthefollowingsocialnetworkingsitesisNOTusedintheAmericanElection?
What’stherelationshipbetweenthetwospeakers?
Thetalkismainlyabout______.
Ifyou’reworriedaboutyourweight,healthyeatingandexercisingmayhelpeaseyourworries.Tobeginwith,beingmoreactive
Someteenagersharborageneralizedresentmentagainstsociety,which______themtherightsandprivilegesofadults,although
Naturally,inagroupofanimalsasdiverseasthesnakes,andwithsomanyvariedenemies,therearenumerousdefensivereactio
Theonly______beforehimwhichbefelthimselftobeincapableofcontemplatingwastheprospectofleavingEmily.
Peoplesometimeswonderabouthowtoensurefamily’sfinancialwell-being.Fora【C1】______varietyofpurposes,familyfinancial
Somedayastrangerwillreadyoure-mailwithoutyourpermissionorscanthewebsitesyou’vevisited.Orperhapssomeonewillca
Theteacher’slectureonAmericanhistorywasthreehourslong,andMorrisfeltvery
随机试题
从本质上说,集约型经济增长方式是( )
目的基因的制备可以通过
Gˉ性菌不具备的成分是
高血压、心脏病患者应在医师指导下服用的药是
下列有限责任公司文件,股东有权查阅和复制的有()。
根据《标准施工招标文件》的规定,合同工程尚未全部竣工,其中某项或某几项单位工程或工程设备安装已竣工,根据专用条款约定,需要投入施工期运行的,经()约定验收合格,证明能确保安全后,才能在施工期投人运行。
根据《中华人民共和国会计法》的规定,行使会计工作管理职能的政府部门是()。
下列各项中,属于应当设置的会计账簿有()。
司法重审是案件经一审之后,当事人提起了上诉,二审法院发现一审的事实不清、有问题,证据不足或者程序有违法之处,就把案件发回一审按照一审的程序处理重新审理的制度。再审是为了纠正已经发生法律效力的错误判决、裁定,依照审判监督程序,对案件重新进行的审理的制度。根据
Everyonehasheardthephrase"apictureisworthathousandwords".Videoconferencingprovidesthatpicture,bringingdecision
最新回复
(
0
)