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
专升本
Suppose we built a robot(机器人)to explore the planet Mars. We provide the robot with seeing detectors to keep it away from danger.
Suppose we built a robot(机器人)to explore the planet Mars. We provide the robot with seeing detectors to keep it away from danger.
admin
2019-11-21
67
问题
Suppose we built a robot(机器人)to explore the planet Mars. We provide the robot with seeing detectors to keep it away from danger. It is powered entirely by the sun. Should we program the robot to be equally active at all times? No. The robot would be using up energy at a time when it was not receiving any. So we would probably program it to cease its activity at night and to wake up at dawn the next morning.
According to the evolutionary(进化的)theory of sleep, evolution equipped us with a regular pattern of sleeping and waking for the same reason. The theory does not deny(否认)that sleep provides some important restorative functions. It merely says that evolution has programmed us to perform those functions at a time when activity would be inefficient and possibly dangerous. However, sleep protects us only from the sort of trouble we might walk into; it does not protect us from trouble that comes looking for us. So we sleep well when we are in familiar, safe place, but we sleep lightly, if at all, when we fear that bears will nose into the tent.
The evolutionary theory accounts well for differences in sleep among creatures. Why do cats, for instance, sleep so much, while horses sleep so little? Surely cats do not need five times as much repair and restoration as horses do. But cats can afford to have long periods of inactivity because they spend little time eating and are unlikely to be attacked while they sleep. Horses must spend almost all their waking hours eating, because what they eat is very low in energy value. Moreover, they cannot afford to sleep too long or too deeply, because their survival depends on their ability to run away from attackers.
Cats sleep much more than horses do partly because cats______.
选项
A、need more time for restoration
B、are unlikely to be attackers
C、are more active than horses when they are awake
D、spend less time eating to get enough energy
答案
D
解析
根据原文,猫能够长时间的不活动,因为他们花很少时问吃东西而且在睡眠时候被袭击的可能性较小。B项意为猫不可能称为袭击者,与原文意思不符。
转载请注明原文地址:https://kaotiyun.com/show/2ExC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Findingitdifficultto______totheclimateinthecity,hedecidedtomovetothenorth.
Ourdepartmenthasalargecollectionofbooks,______areinEnglish.
Housewiveswhodonotgoouttoworkoftenfeelthattheyarenotworkingtotheirfull______.
A、Theman’sgirlfriend.B、Asalesgirl.C、Acustomer.D、Apasserby.C
However,trafficoftenreturnstofullspeedwithinmonthsasdriversbecomeusedtoseeingthepaintedbars.
Anotherpointofthemassmediais______itgivespeopletheinformationtheyneedintheirdailylives.
A、Keepacoolheadinthefirstplace.B、Tellthemiftheylieagain,theywillbepunished.C、Punishtheirchildren.D、Tellthe
Wemustknowwhatweshoulddoandwhatweshouldavoid______agoodimpressiononothersinpublicplace.
Itisveryinterestingtonotewherethedebateaboutdiversity(多样化)istakingplace.Itistakingplaceprimarilyinpolitical
随机试题
元代把汉语共同语称为()
某税务机关2001年第二季度在对本辖区纳税户的经营情况进行彻底摸底后,决定对某纳税户的定额从7月起适当调整,并于6月底发了调整定额的通知。该纳税户的定额由原来的40000元调整为50000元。通知下发后,该纳税户不服,公开表示7月底后要搬离此地经营,并称7
某企业与银行商定的周转信贷额为200万元,承诺费率为0.5%,企业借款120万元,平均使用8个月,那么,借款企业向银行支付承诺费()元。
在计件工资制中,()规定着单位生产时间内完成合格产品数量的标准尺度。
促进国民经济又好又快发展,必须(),推动产业结构优化升级。
下列各句中,有语病的一句是()。
BytheTreatyofParisof1763,whichendedthewarwiththeFrenchandtheIndians,EnglandgainedpossessionofCanadaandall
Imaginemyvexationwhentheysaidtheywouldcometodinnerandthendidn’tshow.
Ifyoucouldgoonvacationasanyoneyouwanted,whowouldyouchoose?JoelStaindecidedhe’dmakeagreatRickyMartin.Welco
Islanguage,likefood,abasichumanneedwithoutwhichachildatacriticalperiodoflifecanbestarvedanddamaged?Judgin
最新回复
(
0
)