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
Large animals that inhabit the desert have evolved a number of adaptations for reducing the effects of extreme heat. One adaptat
Large animals that inhabit the desert have evolved a number of adaptations for reducing the effects of extreme heat. One adaptat
admin
2016-02-04
73
问题
Large animals that inhabit the desert have evolved a number of adaptations for reducing the effects of extreme heat. One adaptation is to be light in color, and to reflect rather than absorb the Sun’s rays. Desert mammals also depart from the normal mammalian(哺乳动物的)practice of maintaining a constant body temperature. Instead of trying to keep down the body temperature deep inside the body, which would involve the expenditure of water and energy, desert mammals allow their temperatures to rise to what would normally be fever height, and temperatures as high as 46 degrees Celsius have been measured in Grant’s gazelles. The overheated body then cools down during the cold desert night, and indeed the temperature may fall unusually low by dawn, as low as 34 degrees Celsius in the camel. This is an advantage since the heat of the first few hours of daylight is absorbed in warming up the body, and an excessive buildup of heat does not begin until well into the day.
Another strategy of large desert animals is to tolerate the loss of body water to a point that would be fatal for nonadapted animals. The camel can lose up to 30 percent of its body weight as water without harm to itself, whereas human beings die after losing only 12 to 13 percent of their body weight. An equally important adaptation is the ability to replenish(补充)this water loss at one drink. Desert animals can drink prodigious(巨大的)volumes in a short time, and camels have been known to imbibe over 100 liters in a few minutes. A very dehydrated person, on the other hand, cannot drink enough water to dehydrate at one session, because the human stomach is not sufficiently big and because a too rapid dilution(稀释)of the body fluids causes death from water intoxication. The tolerance of water loss is of obvious advantage in the desert, as animals do not have to remain near a water hole but can obtain food from grazing sparse and far-flung pastures. Desert-adapted mammals have the further ability to feed normally when extremely dehydrated: it is a common experience in people that appetite is lost even under conditions of moderate thirst.
Questions:
When is the internal temperature of a large desert mammal lowest?
选项
A、Just before sunrise.
B、In the middle of the day.
C、Just after sunset.
D、Just after drinking.
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/MUPO777K
0
在职攻硕英语联考
相关试题推荐
Thelanguageexpertsbelievethattheageforlearningaforeignlanguageis6yearsold.
Manycriticsofthecurrentwelfaresystemarguethatexistingwelfareregulationsfosterfamilyinstability.Theymaintainthat
Manyobjectsindailyusehaveclearlybeeninfluencedbyscience,buttheirformandfunction,theirdimensionsaridappearance
Talktoanyoneinthedrugindustry,______you’llsoondiscoverthatthescienceofgeneticsisthebiggestthingtohitdrugre
DubbedBrainology,theunorthodoxapproachusesbasicneurosciencetoteachkidshowthebrainworksandhowitcancontinueto
Whatoursocietysuffersfrommosttodayistheabsenceofconsensusaboutwhatitandlifeinitoughttobe.Suchconsensusca
Inthedesert,evenasmallcupofwatermaybea______oflifeordeath.
Man:Idon’tknowwhyProfessorCline’sphonenumberisn’tlistedinthedirectory.Woman:Butitis.Questions:Whatdoesthew
Besidesactiveforeignenterprisesanda【51】numberofprivateemployers,aconsequentialnewdevelopmentwasthedevelopmentof
随机试题
Everyoneneedsabreak,andvacationsarenotmeantforseriousstudy.【D1】________TheSpringFestivaliscomingupsothis
简述结构语言学对语法的分类。
区分表皮葡萄球菌与腐生葡萄球菌的药敏试验是
对于表内资产风险权重赋予权重为0的有()。
燕贾祖璋①自从春风唤醒了芳草以后,依依袅袅的杨柳垂枝上的点点银色芽苞中,抽放着浅黄嫩绿的新叶;秃濯僵立的桃李枯丫间,也点缀着娇红洁白的花葩。当晶莹和暖的阳光照耀万物的时候,在这红桃绿柳中间,更容易瞥见一种呢喃软语、轻扬梭穿的鸟类
关于性格和气质之间的关系描述正确的是()。
在日常生活中,礼貌语言作用之大往往超出一般人的______。当人与人之间发生这样那样的______时,礼貌、谦让的语言会如熏风般暖人心扉,将龃龉化为乌有,令睚眦变成笑靥。填入画横线部分最恰当的一项是()。
汉武帝在位初年,西汉国库中积蓄了大量的粮食和财钱,这说明了:
社会主义法律适用的基本要求是()。
Whatdoesitmeantorelax?Despite【C1】______thousandsoftimesduringthecourseofourlives,【C2】______havedeeplyconsidered
最新回复
(
0
)