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
42
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】______ .
【C11】
选项
A、which
B、that
C、what
D、much
答案
B
解析
本句意为:一只常见蜥蝎的正常体温只比人的体温低一到两度,所以并不能说它是冷血动物。空白处需要填一个代词,代替前面提到的温度,四个选项中只有that可以指代前面所用到的词以避免用词的重复,所以选项B对。
转载请注明原文地址:https://jikaoti.com/ti/73gMFFFM
0
专业英语四级
相关试题推荐
What’stherelationshipbetweenthetwospeakers?
Hewasoneofthegreatestscientiststheworldhaseverknown,yetifIhadtoconveytheessenceofAlbertEinsteininasingl
Thefifthgenerationcomputers,withartificialintelligence,______andperfectednow.
Thoughcomputerhasmanyadvantages,itisbynomeanswithoutits______.
Thecrisishas【C1】______questionsaboutthelargeoilcompaniesandwindfallprofits.Criticsoftheoilindustry【C2】______
Mostyoungpeopleenjoysomeformofphysicalactivity.Itmaybewalking,cycling,orswimming,orinwinter,skatingorskiing
Whilecrossingthemountainarea,allthemencarriedgunslestthey______bywildanimals.
Thespeakerattractedtheaudienceattheverybeginningofthelecturebygivinga______descriptionofhispersonalexperienc
It’ssaidthemostexcitingkindofeducationisalsothemostpersonal.Nothingcan【C1】______thejoyofdiscoveringsomething
随机试题
制定消费政策需要考虑的因素有
培育和践行社会主义核心价值观,是()的重大举措。
男性,16岁,1天前摔伤右肘部。体查:右肘关节肿胀、压痛明显,活动受限,内上髁处有骨擦感,有一块1.5cm×2cm骨折片。下列哪项检查最有诊断意义
抗代谢类抗癌药烷化剂类抗癌药
医疗机构的宗旨是()
基金账户能够用于()的认购及交易。
农历的岁首称为春节,旧时,从农历十二月初八到正月十五元宵节,都属于新年的范畴。()
抛掷两枚骰子,在第一枚骰子出现的点数能够被3整除的条件下,求两枚骰子出现的点数之和大于8的概率.
设随机变量X的绝对值不大于1,在事件{-1<X<1)出现的条件下,X在(-1,1)内任一子区间上取值的条件概率与该子区间的长度成正比.试求:X的分布函数F(x)=P(X≤x);
Whileadmiringthatthisforecastwas______uncertain,thescientistswarnedagainsttreatingitasacryofwolf.
最新回复
(
0
)