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
考研
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
2012-02-02
75
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 U.S. had acquired when it purchased Louisiana, and the Apollo 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 before.
Today Mars looms (隐约出现) as humanity’s next great terra incognita (未探明之地 ). 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 provide 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 once had abundant stable, liquid water and by the continuing controversy over suggestions that bacterial fossils rode to Earth on a meteorite (陨石) 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. (362 words)
According to the passage, the chief purpose of explorers in going to unknown places in the past was______.
选项
A、to display their country’s military might
B、to accomplish some significant science
C、to find new areas for colonization
D、to pursue commercial and state interests
答案
D
解析
转载请注明原文地址:https://www.kaotiyun.com/show/M3na777K
本试题收录于:
艺术硕士(艺术基础)题库专业硕士分类
0
艺术硕士(艺术基础)
专业硕士
相关试题推荐
Attentiontodetailissomethingeveryonecanandshoulddo—especiallyinatightjobmarket.BobCrossley,ahuman-resourcesex
Dogsaresocialanimalsandwithoutpropertraining,theywillbehavelikewildanimals.Theywillspoilyourhouse,destroyyou
Thefitnessmovementthatbeganinthelate1960sandearly1970scenteredaroundaerobicexercise(有氧操).Millionsofindividual
Sincewearesocialbeings,thequalityofourlivesdependsinlargemeasureonourinterpersonalrelationships.Onestrengtho
Nearlyall"speedreading"courseshavea"pacing"element—sometimingdevicewhichletsthestudentknowhowmanywordsaminut
Thedeclineinmoralstandards—whichhaslongconcernedsocialanalysts—hasatlastcapturedtheattentionofaverageAmericans.
Mostepisodesofabsent-mindedness—forgettingwhereyouleftsomethingorwonderingwhyyoujustenteredaroom—arecausedbya
It’snosecretthatmanychildrenwouldbehealthierandhappierwithadoptiveparentsthanwiththeparentsthatnaturedealtt
Believeitornot,opticalillusion(错觉)cancuthighwaycrashes.Japanisacaseinpoint.Ithasreducedautomobilecrashe
Thereseemsnevertohavebeenacivilizationwithouttoys,butwhenandhowtheydevelopedisunknown.Theyprobablycameabout
随机试题
人防工程内设置有旅店、病房、员工宿舍时,不得设置在地下()及以下层,并应划分为独立的防火分区,其疏散楼梯不得与其他防火分区的疏散楼梯共用。
以企业在现时收入和企业成本费用的现时成本配比确定的收益作为企业利润构成处理的,是以()为前提的现时成本收益。
测量大跨径桥梁结构纵向线形,测量截面不宜少于()个。
“账外账”是指不在依法设置的会计账簿上对经济业务事项进行统一登记核算,而另外私自设置会计账簿进行登记核算的行为。()
根据城市维护建设税法律制度的规定,下列表述中,正确的有()。
下列哪种属于精神分析法?()
阅读下面这段文字,用一句话给“绿色塑料”下定义。所谓“绿色塑料”,并不是指绿颜色的塑料,而是指能够自行降解和再利用,不会污染环境的塑料。具体地说,就是指在一定使用期限内具有与普通塑料制品同样的功效,而在完成一定的功效后能迅速自行降解,与自然环境同
2013年医药工业规模以上企业实现主营业务收入21681.6亿元,同比增长17.9%,增长速度较2012年下降了2.5个百分点,自2007年以来首次低于20%。2013年医药工业规模以上企业实现利润总额2197.0亿元,同比增长17.6%,增速
随着互联网的飞速发展,足不出户购买自己心仪的商品已经成为现实。即使在经济发展水平较低的国家和地区,人们也可以通过网络购物来满足自己对物质生活的追求。以下哪项最能质疑上述观点?()
“国”古音声调是()。(复旦大学2015)
最新回复
(
0
)