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
More than a year has passed since the space shuttle Columbia broke into pieces over central Texas. This past January President B
More than a year has passed since the space shuttle Columbia broke into pieces over central Texas. This past January President B
admin
2011-05-29
29
问题
More than a year has passed since the space shuttle Columbia broke into pieces over central Texas. This past January President Bush announced a long-term program of space exploration that would return human beings to the Moon, and thereafter send them to Mars and beyond. As this magazine (Natural History) goes to press, the twin Mars Exploration Rovers, Spirit and Opportunity, are wowing the scientists and engineers at the rovers’ birthplace--NASA’s Jet Propulsion Laboratory (JPL)--with their skills as robotic field geologists. JPL’s official rover Web site is being stampeded by visitors. The confluence of these and other events resurrects a perennial debate: with two shuttle failures out of 112 missions, and the astronomical expense of the manned space program, can sending people into space be justified, or should robots do the job alone?
Modern societies have been sending robots into space since 1957, and people since 1961. Fact is, it’s vastly cheaper to send robots: in most cases, a fiftieth the cost of sending people. Robots don’t much care how hot or cold space gets; give them the fight lubricants, and they’ll operate in a vast range of temperatures. They don’t need elaborate life-support systems, either. Robots can spend long periods of time moving around and among the planets, more or less unfazed by ionizing radiation. They do not lose bone mass from prolonged exposure to weightlessness, because, of course, they are boneless. You don’t even have to feed them. Best of all, once they’ve finished their jobs, they won’t complain if you don’t bring them home.
But there’s a flip side to this argument. Back in the late 1960s and early 1970s, in the days of NASA’s manned Apollo flights to the Moon, no robot could decide which pebbles to pick up and bring home. But when the Apollo 17 astronaut Harrison Schmitt, the only geologist to have walked on the Moon, noticed some odd, orange and black soil on the lunar surface, he immediately collected a sample. It turned out to be minute beads of volcanic glass. Today a robot can perform staggering chemical analyses and transmit amazingly detailed images, but it still can’t react, as Schmitt did, to a surprise. By contrast, packed inside the 150-pound mechanism of a field geologist are the capacities to walk, run, dig, hammer, see, communicate, interpret, and invent.
And of course when something goes wrong, an on-the-spot human being becomes a robot’s best friend. After landing on Mars this past January 3, did the Spirit rover just roll right off its lander platform and start checking out the neighborhood? No, its air-bags were blocking the path. Not until January 15 did Spirit’s remote controllers man-age to get all six of its wheels rolling on Martian soil. Anyone on the scene on January 3 could have just lifted the airbags out of the way and given Spirit a little shove.
The word "stampeded" (Line 7, Para. ) most probably means ______ .
选项
A、hacked severely
B、clicked frequently
C、closed forever
D、neglected purposely
答案
B
解析
这个单词与上文的联系非常紧密。上文提到:美国国家航空和宇宙航空局推进技术实验室,科学家和工程师正在为它们具备了机器人地质学家资格而欢呼。后面紧接着提到网站也被访问着。我们可以了解人们对于航天计划的关注,还由此引发了讨论,但是人们并不是反对或者仇恨这项计划,因此可以判断出JPL的网站被点击的频率很高,而不是被黑客攻击或被关闭,更不是有意不去关注。因此本题的答案是B。
转载请注明原文地址:https://kaotiyun.com/show/KQ6O777K
0
考博英语
相关试题推荐
Iamsorrybutthefileswillnotbeavailableuntil25January.Thefilescanbedelivered______.
ReadtheinformationbelowaboutmakinginternationalpaymentsthroughtheInternet.Choosethecorrectwordtofilleachga
ALLCLERICALSTAFFIncaseofaproblemwithanyofficeequipment,adviseyourSupervisor,whowillcallintheTechnicalDepart
TheforeignministerwouldrevealnothingabouthisrecenttouroftheMiddleEastbeyondwhathadalreadybeenannouncedatthe
Sleepisanimportantpartofourlives.Wespendoutone-thirdofourlivessleeping.Formillionsofpeople,【C1】______,gett
Sleepisanimportantpartofourlives.Wespendoutone-thirdofourlivessleeping.Formillionsofpeople,【C1】______,gett
Sleepisanimportantpartofourlives.Wespendoutone-thirdofourlivessleeping.Formillionsofpeople,【C1】______,gett
各学科的发展日新月异,令人称奇,但衡量知识、能力的方法却依然如故,非常原始。迄今为止,教育工作还没有找到比考试更有效、更可靠的方法,着实有点离奇。尽管有不少人认定,考试能衡量出一个人的知识水平,但实际情况恰恰相反,这是有目共睹的。要想考察一个人死记硬背的本
Doctorshavelongknownthatifapatientis______thathewillrecoverandistreatedwithsympathy,hispainwilloftendisap
随机试题
副交感神经的主要功能是()。
大拉翅旗头在清代初期就已经普遍流行。()
以下辅料在片剂中作崩解剂的是
引起胰腺细胞坏死的是
简要概述消防车登高操作场地的检查方法的主要操作内容。
2020年1月,甲公司与乙公司签订劳务派遣协议,派遣刘某到乙公司从事临时性工作。2020年5月,临时性工作结束,两公司未再给刘某安排工作,也未再向其支付任何报酬。2020年7月,刘某得知自2020年1月被派遣以来,两公司均未为其缴纳社会保险费,遂提出解除劳
根据《浙江省旅游管理条例》规定,设立旅游度假区,应当报省人民政府和国务院批准。()
设对(Ⅰ)中的任意向量ξ2,ξ3,证明ξ1,ξ2,ξ3线性无关。
Thosewhowishtoscheduletheirannualcheck-upscancallusandmake______inadvance.
Petroleumproducts,suchasgasoline,kerosene,homeheatingoil,residualfueloil,andlubricatingoils,comefromonesource
最新回复
(
0
)