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
2014-05-25
32
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://jikaoti.com/ti/mONGFFFM
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
Inanagewhenwastetodaymeansalacktomorrow,makinguseofeveryavailableresourcebecomesmoreandmoreimportant.Ascoa
(英语类学生必做)Sleepisimportanttousbecauseithelpsrestoreorgansandtissuesinourbody.Buthowmuchsleepdoweactuall
Oneofthemostimportantproblemsishowto______studentsinterestsinlearningEnglish.
Manychangesaretakingplacein"foodstyle"intheUnitedStates.TheUnitedStatesistraditionallyfamous【36】itsverysolid
Campmeetingsoften______forseveraldays.
Haveyou【56】askedyourselfwhychildrengotoschool?Youwillprobablysaythattheygo【57】languages,mathematics,history,sci
Isupposeyouarenotserious,______?
Heismorediligentthan______inhisclass.
Sally’sscoreontheexamisthelowestintheclass.She______hard.
Anyonewhohasriddenonarailroadtrainknowshowrapidlyanothertrain【C1】______bywhenitistravellinginthe【C2】______dire
随机试题
Internet中采用域名地址,而一般不采用IP地址的原因是()。
宋朝初年的最高行政机构是()。
增加固定资产一台,名称:车床,类别:机器设备,部门:生产部,增加方式:购入,使用状况:在用,开始使用日期:2014年11月11日,使用年限:10年,原值80000,净残值率3%。(用户名003王红,账套001A公司,操作日期2014年11月11日)
基金份额持有人是()。Ⅰ.基金的出资人Ⅱ.基金资产的所有者Ⅲ.基金投资回报的受益人Ⅳ.基金的管理者
王某为做生意向其朋友张某借款10000元,当时未约定利息。王某还款时,张某索要利息,王某以没有约定为由拒绝。根据合同法律制度的规定,下列关于王某是否支付利息的表述中,正确的是()。
A.MaybetodayismyluckydayB.ItwillbesocooltowinitC.wecanbetheluckywinnerA:Hey,didyouhearthat?Thelott
马克思在19世纪70年代、列宁在俄国二月革命后,都曾经认为
在VisualFoxPro中,定义数据的有效性规则时,在规则框输入的表达式的类型是
我们所写的每条C语句,经过编译最终都将转换成二进制的机器指令。关于转换以下说法错误的是
A、HeisMr.Romero’sagent.B、Heisanentertainmentjournalist.C、Heisthewoman’sassistant.D、Heisafamousmoviestar.C
最新回复
(
0
)