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
For centuries, explorers have risked their lives venturing into the unknown for reasons that were to varying degrees economic an
For centuries, explorers have risked their lives venturing into the unknown for reasons that were to varying degrees economic an
admin
2010-07-06
33
问题
For centuries, explorers have risked their lives venturing into the unknown for reasons that were to varying degrees economic and nationalistic. Columbus went west to look for better trade routes to the Orient and to promote the greater glory of Spain. Lewis and Clark journeyed into the American wilderness to find out what the US had acquired when it purchased Louisiana, and the Appolo astronauts rocketed to the moon in a dramatic show of technological muscle during the cold war.
Although their missions blended commercial and political-military imperatives, the explorers involved all accomplished some significant science simply by going where no scientists had gone.
Today Mars looms as humanity’s next great terra incognita. And with doubtful prospects for a short- term financial return, with the cold war a rapidly fading memory and amid a growing emphasis on international cooperation in large space ventures, it is-clear that imperatives other than profits or nationalism will have to compel human beings to leave their tracks on the planet’s reddish surface. Could it be that science. which has long played a minor role in exploration, is at last destined to take a leading role? The question naturally invites a couple of others: Are there experiments that only humans could do on Mars? Could those experiments pro- vide insights profound enough to justify the expense of sending people across interplanetary space?
With Mars the scientific stakes are arguably higher than they have ever been. The issue of whether life ever existed on the planet, and whether it persists to this day, has been highlighted by mounting evidence that the Red Planet had abundant stable, liquid water and by the continuing controversy over suggestions that bacterial fossils rode to Earth on a meteorite from Mars. A more conclusive answer about life on Mars, past or present, would give researchers invaluable data about the range of conditions under which a planet can generate the complex chemistry that leads to life, If it could be established that life arose independently on Mars and Earth, the finding would provide the first concrete clues in one of the deepest mysteries in all of science: the prevalence of life in the universe.
What is the main goal of sending human missions to Mars?
选项
A、To find out if life ever existed there and whether it still exists there.
B、To see if animals could survive there.
C、To prove the feasibility of large-scale space ventures.
D、To show the leading role of science in space exploration
答案
A
解析
细节题。第四段论述了人类探索火星的目的。其中第二句提到了火星上是否存在过生命、生命是否延续到现在,且后文中又强调探索的是生命所必需的条件,及过去和现在是否存在生命,选A 。
转载请注明原文地址:https://kaotiyun.com/show/5KDd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
WhichofthefollowingisNOTawaytopunishtheonewhocommitsacrime?
Whatisthepassagemainlyabout?Intermsofthescaleofthechange,whatdoestheauthorconsiderthepresentchange?
Accordingtothepassage,thechiefpurposeofexplorersingoingtounknownplacesinthepastwas______.Atpresent,aproba
WhatisKeet’soccupation?
Themoretimescientistsspenddesigningcomputers,themoretheymarvelatthehumanbrain.Tasksthatstumpthemostadvanced
Mostscientistsblamepeople,atleastinpart,forglobalwarming.Now,someresearcherssaypeoplemaybepartlytoblamefor
Smogissomethingcombinedbysmokeandfog.Londonisalwaysknownforits"blackfogs".Inthewinterof1952,amilkywhitef
Almostdaily,thegulfbetweeneducationandemploymentwidens.Careersofficerscomplainaboutasystemthatpresentsthemwith
Scientistsclaimthatairpollutioncausesadeclineintheworld’saverageairtemperature.Inordertoprovethattheory,ecol
随机试题
患者,女,38岁。乏力半年,贫血貌。平时月经量多,体检发现子宫肌瘤。化验检查:血红蛋白60g/L,白细胞及血小板正常,骨髓增生活跃,以红系增生明显,幼红细胞体积小,红细胞中心淡染区扩大。某患者经治疗后血红蛋白升高,但一直未能持续正常,进一步的治疗建议是
地图以概括、抽象的形式反映出制图对象的带有规律性的类型特征,而将那些次要、非本质的物体舍弃,这个过程称为制图综合。()是制图综合对制图现象进行的两种基本处理。
投资基金集中社会资金的方式主要为向投资者发行()。
证券公司从事证券发行上市保荐业务,应依照《管理办法》的规定向国务院申请保荐机构资格。( )
(2011年)下列存货计价方法中,能够准确反映本期发出存货和期末结存存货的实际成本、成本流转与实物流转完全一致的是()。
2018年1月1日,A公司和B公司共同出资购买一栋写字楼,各自拥有该写字楼50%的产权,用于出租收取租金。合同约定,该写字楼相关活动的决策需要A公司和B公司一致同意方可作出;A公司和B公司的出资比例、收入分享比例和费用分担比例均为各自50%。该写字楼购买价
《老年人权益保障法》明确指出:老年人养老主要依靠()。
在进行“物质的跨膜运输”一课的教学时,教师为了让学生更好地理解“扩散作用”,用国外某版本生物教材上的有关扩散作用的“迷你实验”替换了该校所用教科书上的实验,在本课教学中取得了良好的效果。该教师的做法()。
解除降级行政处分,意味着恢复原级别。()
根据我国《宪法》,()决定乡、民族乡、镇的建置和区域划分。
最新回复
(
0
)