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 bound-aries of effective func
Cells cannot remain alive outside certain limits of temperature, and much narrower limits mark the bound-aries of effective func
admin
2015-04-24
52
问题
Cells cannot remain alive outside certain limits of temperature, and much narrower limits mark the bound-aries 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 body 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 blooded" 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】_________.
【C5】
选项
A、they
B、it
C、we
D、what
答案
B
解析
形式主语。空格的词要作that引导从句的形式主语。选项中,只有it能作形式主语。故答案为B。
转载请注明原文地址:https://kaotiyun.com/show/fgLO777K
0
考博英语
相关试题推荐
Theriseof"temp"workhasfurthermagnifiedthedecreasingrightsandalienationoftheworker.ItiscommoncorporatePractic
Whensolidchangestoliquid,it______heatfromallsubstancesnearitandthisreducesthetemperaturesurroundingit.
ClassifiedAdvertisingisthatadvertisingwhichisgroupedincertainsectionsofthepaperandisthusdistinguishedfromdisp
Priortothe20thcentury,manylanguageswithsmallnumbersofspeakerssurvivedforcenturies.Theincreasinglyinterconnected
GeniusThegreatestresultsinlifeareattainedbysimplemeans,andtheexerciseofordinaryqualities.Thecommonlifeof
For【C1】______thebloodshedandtragedyofD-Day,thebeachesofNormandywillalwaysevokeacertain【C2】______:ayearning
For【C1】______thebloodshedandtragedyofD-Day,thebeachesofNormandywillalwaysevokeacertain【C2】______:ayearning
For【C1】______thebloodshedandtragedyofD-Day,thebeachesofNormandywillalwaysevokeacertain【C2】______:ayearning
Someresearchersfeelthatcertainpeoplehavenervoussystemsparticularly_____tohot,drywinds.Theyarewhatwecallweather
随机试题
患者,男性,46岁,因“眼睑水肿12年,恶心纳差半年,加重1周”入院。12年来患者常于晨起出现双侧眼睑水肿,未在意。半年来出现恶心、纳差,自行服用胃药无效。1周前受凉后咳嗽、咳白痰,伴水肿加重、乏力,尿量减少,每日尿量约300ml。既往患“慢性肾炎”10
______fromthe18thfloorwhenhesawthepolicecomingnear.
患者,男,45岁,素日咳嗽,每遇天冷加重。今值隆冬,昨日忽又咳嗽频作,痰多清稀,微喘,头痛身疼,无汗,恶寒发热,微觉烦躁,口渴,舌苔白,脉浮弦,宜选
A.CMC-NaB.L-HPCC.PVPD.PVAE.HPC
不仅适用于管道保温,同时也适用于阀门、管件、石油化工设备和炉窑的保温,具有保温、保冷、隔声、防火等作用的绝热结构形式是()。
关于犹豫期条款说法正确的是:()
企业自行建造固定资产,应按建造该项资产竣工决算前所发生的必要支出,作为固定资产的成本。()
针对抽样风险和非抽样风险,以下说法中,错误的是()。
简述无氧耐力的生理学基础及其训练方法。
Inthefaceofunexpecteddifficulties,hedemonstratedatalentforquick,______action.(2010-70)
最新回复
(
0
)