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
59
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】______ .
【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://kaotiyun.com/show/4lmK777K
0
专业英语四级
相关试题推荐
Whoaretalking?
Whatdothespeakersmainlydiscuss?
Hewasoneofthegreatestscientiststheworldhaseverknown,yetifIhadtoconveytheessenceofAlbertEinsteininasingl
Everythingwithmeisgoingwell;sopleasedonotbeanxiousonmyaccount,______.
Hisfeatureswereagreeable;hisbody,______slightofbuild,hadsomethingofathleticoutline.
Ifyou’reworriedaboutyourweight,healthyeatingandexercisingmayhelpeaseyourworries.Tobeginwith,beingmoreactive
Acollegefreshmansquirmsanxiouslyonachairinmyoffice,hiseyesavoidingmine,thoseofhisEnglishprofessor,asheexpl
Fromchildhoodtooldage,wealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.When.
Hismasterpiece,araw,chillingand______cutenovelofhumanpassionsreducedtotheirdeadliestessence,isagreatsuccess.
Peoplefromallwalksoflifetookpartinthedemonstration.Theunderlinedpartmeans______.
随机试题
微循环中具有物质交换功能的是()
对软盘上存放的信息进行读写操作的机械装置称为软磁盘驱动器。
简述企业对员工的责任。
患者,女性,48岁,发现颈部肿物1个月。颈部彩超显示:甲状腺右叶见一4cm×3cm的孤立性结节,放射性核素扫描为冷结节,T3、T4水平正常。病理检查:肿瘤类圆形,边界清、有包膜,包膜上可见扩张血管。镜下,瘤组织由大小较一致的小型滤泡组成,细胞无明显异型性,
A.异硫氰酸荧光素B.四乙基罗丹明C.四甲基异硫氰酸罗丹明D.藻红蛋白E.镧系螯合物最适用于时间分辨荧光免疫测定的是
小明因为期中考试没考好,一直闷闷不乐,玩游戏都不能让他开心。他表现出的情绪状态属于()。
现场检查按照检查范围划分为()。
支付(Alipay)是中国最大的第三方在线支付平台,由阿里巴巴集团(AlibabaGroup)于2004年创建。
Therearetwofactorswhichdetermineanindividual’sintelligence.Thefirstisthesortofbrainheisbornwith.Humanbrains
Acircleofclosefriendsandstrongfamilytiescanincreaseaperson’shealthmorethanexercise,losingweightorquittingci
最新回复
(
0
)