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
43
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
(Para.3,PassageOne)They’llbringnewlifeintoyourcircleoffriendsandofferfreshideasforthingstodoandplaces
Friendsplayanimportantpartinourdailylives,andalthoughwemaytakefriendshipforgranted,weoftendon’tclearlyunder
GenerationsofAmericanshavebeenbroughtuptobelievethatagoodbreakfastisoneoflife’sessentials.Eatingbreakfastat
Great()thedifficultiesare,wemustdoourbesttosucceed.
Whenthelittlegirlawoke,shefoundherself()byagroupofsoldiers.
Solittle______aboutchemistrythatthelecturewascompletelybeyondme.
Donotdisturbme.I_____lettersallmorningandhavewrittentensofar.
I’d______theoperationunlessitisabsolutelynecessary.
Theyoungmanstruggledto______wherehewasatthetimethemurdertookplace.
随机试题
A.病因B.无明显诱因C.获得性D.老年人E.免疫异常
胆囊切除术时,胆总管探查指征是
贫血伴轻度黄疸,网织红细胞5%以上,最可能的诊断是
承担安全评价工作的机构,出具虚假证明尚不够刑法处罚且违法所得5000元以上的,并处违法所得的()罚款。
企业上交所得税时应借记“所得税费用”账户,贷记“银行存款”账户。()
海上货物运输保险的索赔时效从( )之日起算。
用块材与砂浆砌筑成墙体,用钢筋混凝土楼板和钢筋混凝土屋面板建成的建筑称为()结构建筑。
一个四位数“口口口口”分别能被15、12和10除尽,且被这三个数除尽时所得的三个商的和为1365,问四位数“口口口口”中四个数字的和是多少?()
求
Theshortageofenergyisgettingworse.It______animmediatesolution.
最新回复
(
0
)