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
2018-08-16
41
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.
According to the author, we cannot sleep well when we______.
选项
A、are worrying about our safety
B、are overworked
C、are in a tent
D、are away from home
答案
A
解析
根据原文中举例,一旦我们担心熊冲进帐篷我们睡得很浅。由此可知A项正确。
转载请注明原文地址:https://www.kaotiyun.com/show/xlPC777K
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
A、Becausetheypaymuchattentiontotoiletcleanliness.B、Becausetheyprovidediscountsonticketprices.C、Becausetheytryt
(Para.3,PassageOne)They’llbringnewlifeintoyourcircleoffriendsandofferfreshideasforthingstodoandplaces
A、Futureresearchers.B、Collegestudents.C、Companyemployees.D、Successfulartists.B
(Para.2,PassageTwo)Researchhasalsobeendoneintothewaypeople’sbehaviorchangesinanumberofsmall,unimportant
________comesbackfirstissupposedtowintheprize.
A、Thefurnishedapartmentwasinexpensive.B、Theapartmentwasprovidedwithsomeoldfurniture.C、Thefurnitureunthemarketw
A、Tolookforcreativeideasofawardingemployees.B、Toexplorestrategiesforloweringproductioncosts.C、Toseeknewapproac
A.Theonlythingneighborshaveincommontobeginwithisproximity,andunlesssomethingmoredevelops,thatisn’treasonen
Theyoungmanstruggledto______wherehewasatthetimethemurdertookplace.
Asmileisagiftthatanyonecangive.Itcostsnothing,butsavesmuch.Itenrichesthosewhoreceive,withoutimpoverishing(使
随机试题
PowerPoint2010首次启动后默认会新建一个名为________的空白演示文稿,在其中只含一张幻灯片,不包括其他任何内容,以方便用户进行创作。
A.分裂池B.成熟池C.贮存池D.循环池E.边缘池粒细胞具有合成DNA及分裂能力的是
犬,5岁,突发肌肉震颤,很快转为四肢无力,腱反射消失,且心律不齐,呼吸困难,血钾明显升高,引起该病的原因是
某场地地基土为一强透水层,含水量w=22%,地下水分析成果pH=5.4,侵蚀性CO2含量为53.9mg/L,则该地下水对混凝土结构的腐蚀性所属等级为( )。
下列对带锯机操纵机构的安全要求中,错误的是()。
单位负责人对本单位的会计工作和会计资料的真实性、完整性负责,不得授意、指使、强令会计机构和会计人员违法办理会计事项。()
金融市场常被称为“资金的蓄水池”和“国民经济的气象台”,分别指的是金融市场的()。
社会主义改造基本完成后,国家政治生活的主题是()
Frequentlysingle-parentchildren______someofthefunctionsthattheabsentadultinthehousewouldhaveserved.
(1)TheEnglish,infact,arestronglygiftedwiththeruralfeeling.Theypossessaquicksensibilitytothebeautiesofnature
最新回复
(
0
)