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
56
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] 【C12】
选项
A、But
B、However
C、Therefore
D、Meanwhile
答案
C
解析
由于前句提出了反例,指出传统的分类有不足之处。本句接着讲到更准确的分类。因此可推断它们之间是因果关系,所以选C。
转载请注明原文地址:https://tihaiku.com/zcyy/3189751.html
相关试题推荐
Asthetemperaturedroppedabruptly,thecamperswere______alloverwithcold.
Theweathermanbroadcaststhe______intemperaturetwiceaday.A、diversionB、va
Whattopicdoesthespeakerexplainindetails?[br][originaltext]Certain
Whattopicdoesthespeakerexplainindetails?[br][originaltext]Certain
Whattopicdoesthespeakerexplainindetails?[originaltext]Certainphras
Outsidemyofficewindowthereisafire______ontheright.A、escapeB、ladderC
Asoneoftheyoungestprofessorsintheuniversity,Longfellowiscertainlyon
Therewasa______stormoutsideanditwashardtowalk,soyou’dbetterstayi
Themembershipcardentitledhim______certainprivilegesintheclub.A、onB、in
AfterwatchingthatmovieabouttheAnti-JapaneseWar,peoplecannothelpbut__
随机试题
教师所表现的每一种关怀之情和慷慨之举,无论多小,都会使受益者欣喜不已,极少人过后会忘记。(makeone’sday)Everygestureofcon
Almostallrecognizethatnon-scientistsaswellaslaymenareinterestedinsci
Desperatelyshortoflivingspaceand【C1】______pronetoflooding,theNether
中央银行在公开市场上大量昀买有价证券,意味着货币政策()A.放松 B.紧缩
处方中的辅助部分为A.使药 B.要药 C.臣药 D.佐药 E.
特殊管理的药品是指A.麻醉药品、精神药品、毒性药品、抗肿瘤药品B.麻醉药品、放射
丙磺舒延长青霉素药效持续时间的原因是丙磺舒A.减少青霉素的分布 B.减慢青霉素
有的人在逆境中奋起,有的人在逆境中消沉;有的人在顺境中如鱼得水;有的人在顺境中却
( )的对象一般具有明显的数量关系,量化后的数据直接提示了素质测评对象的实际特
2011年上半年,全国电信业务总量累计完成5681.1亿元,比上年同期增长15.
最新回复
(
0
)