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 living in the desert have developed a number of adaptations for reducing the effects of extreme heat. One adaptati
Large animals living in the desert have developed a number of adaptations for reducing the effects of extreme heat. One adaptati
admin
2011-03-01
26
问题
Large animals living in the desert have developed 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 animals also depart from other animals’ normal practice of maintaining a constant body temperature. Instead of trying to keep down the body temperature deep inside the body, which would involve the loss of water and energy, large desert animals 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 over-heated 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 non-adapted animals. The camel can lose up to 30% of its body weight as water without harm to itself, whereas human beings die after losing only 12%-13% of their body weight. An equally important adaptation is the ability to recover this water loss at one drink. Desert animals can drink massive volumes of water in a short time, and camels have been known to drink over 100 liters in a few minutes. A person who severely loses water, on the other hand, cannot drink enough water for recovery at one session, because the human stomach is not sufficiently big and because a too rapid mixing of the body liquid with water 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 by searching quite a few distant places. Desert-adapted animals have the further ability to feed normally when extremely thirsty: it is a common experience in people that appetite is lost even under conditions of moderate thirst.
The word "maintaining" in line 3 of the first paragraph is closest in meaning to ______.
选项
A、reducing
B、preserving
C、avoiding
D、measuring
答案
B
解析
词汇题。Maintain是“维持、保持”的意思,与B项preserve同义。
转载请注明原文地址:https://jikaoti.com/ti/RcdsFFFM
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
GenerationsofAmericanshavebeenbrought【C1】______tobelievethatagoodbreakfastisimportantforhealth.Eatingbreakfasta
Onwhatdayoftheweekwillthemagazinearrive?
Whatprobablyistherelationshipbetweenthetwospeakers?
WhendopeoplemostprobablywearT-shirts,accordingtothespeaker?
Televisionisthemosteffectivebrainwashingmediumeverinventedbyman.Advertisersknowthistobe【C1】______.Childrenarea
Televisionisthemosteffectivebrainwashingmediumeverinventedbyman.Advertisersknowthistobe【C1】______.Childrenarea
Laborforceisdefinedasbeingthetotalnumberofpeoplewhoareavailabletoworkandearnincome.Thisdefinitionincludese
What’stheprobablerelationshipbetweenthetwospeakers?
AlbertEinsteinissaidtohavebeenaskedbyastudent,"Whatfindinghelpedyoumostwhenyouwere【C1】______thetheoryofrela
InEnglandrecentlythreeforeigngentlemenapproachedabusstop.Theystudiedtheinformationonthesignattachedtotheconc
随机试题
直接接触药品的包装材料和容器,必须符合()。
项目运营状况的主要评价指标有()
简述进口到货单证。
通天顺公司所属的“通天顺”邮轮与天神公司所属的“天神”邮轮在粤东海区靖海附近海域发生碰撞,“通天顺”邮轮搁浅沉没,所载油类大量泄漏人海,严重污染了靖海至神泉和甲子近岸海域,造成天然水产品直接经济损失330.73万元、天然渔业资源经济损失992.19万元。对
抵达景点时,下车前地陪要讲清楚并提醒旅游者记住停车地点、离开时间、本景点特色纪念品。()
对个人独资企业投资者取得的生产经营所得应征收企业所得税,不征收个人所得税。()
阅读下文,完成下列4题。司马迁举了一系列“发愤”的著作,有的说理,有的记事,最后把《诗三百篇》笼统都归于“怨”,也作为一个例子。钟嵘单就诗歌而论,对这个意思加以具体发挥。《诗品.序》里有一节话:“嘉会寄诗以亲,离群托诗以怨。至于楚臣去境,汉妾辞宫。
Olderpeoplemustbegivenmorechancestolearniftheyaretocontributetosocietyratherthanbeafinancialburden,accordi
设有关系歌手(歌手号,姓名),根据“歌手”关系建立视图myview,视图中含有包括了“歌手号”左边第一位是“1”的所有记录,正确的SQL语句是()。
Theyear2005isthemidpointofadecadethatspansthreeunique,importanttransitioninthehistoryofhumankind.
最新回复
(
0
)