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
2009-03-16
72
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 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 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.
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
细节题。答案信息见于文章第一句:...for reasons that were to varying degrees economic and nationalistic(因不同程度的经济与国别原因)。
转载请注明原文地址:https://kaotiyun.com/show/AJPd777K
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
Childrenwhogriptheirpenstooclosetothewritingpointarelikelytobeatadisadvantageinexaminations,【C1】______tothe
Answerquestions71~80byreferringtothefollowinggames.Note:AnswereachquestionbychoosingA,B,CorDandmarkit
Itwaslateintheafternoon,andIwasputtingthefinaltouchonapieceofwritingthatIwasfeelingprettygoodabout.Iwa
“Down-to-earth”meanssomeoneorsomethingthatishonest.realisticandeasytodealwith.Itisapleasuretofind【C1】______who
In1959theaverageAmericanfamilypaid$989forayear’ssupplyoffood.In1972thefamilypaid$1,311.Thatwasaprice
In1959theaverageAmericanfamilypaid$989forayear’ssupplyoffood.In1972thefamilypaid$1,311.Thatwasaprice
TherecentsocialandeconomicchangesintheUShavegreatimpactonalltheAmericanhousingsystem.
A=HydropowerB=NuclearpowerC=SolarpowerD=WindpowerWhichpower(power’s)...wasdevelopedtoprovideelectricity
Man’spuzzlementandpreoccupationwithtimebothderiveultimatelyfromhisuniquerelationshiptoit.Allanimalsexistintim
Man’spuzzlementandpreoccupationwithtimebothderiveultimatelyfromhisuniquerelationshiptoit.Allanimalsexistintim
随机试题
Ofalltheunfortunatecircumstancestoemergefromthehousingbust(房地产萧条),oneofthemostunderappreciated(不能估计的)isthedevel
对隔离患者的家属应如何管理?
“经营单位”栏:“贸易方式”栏:
根据个人所得税法律制度的规定,下列各项所得中,按次计算缴纳个人所得税的是()。(2015年)
A公司是一家处于成长阶段的上市公司,正在对2014年的业绩进行计量和评价,有关资料如下:(1)A公司2014年的销售收入为2500万元,营业成本为1340万元,销售及管理费用为500万元,利息费用为236万元:(2)A公司2014年
教育教学活动是教师职业的最基本活动。()
下列哪个选项中的概括和限制都是正确的?()
最近十几年,北亚的气候普遍比较凉。但是,在北亚的日平均气温和湿度比正常水平稍高的前年,那儿生长的庄稼的年产量却显著增加。在下个世纪,像前年那样增高的日平均气温和湿度将有望成为北亚的正常状态。然而科学家预测,在下个世纪北亚大多数地区的庄稼的年产量会下降。下面
坚持和完善公有制为主体、多种所有制经济共同发展的基本经济制度,必须毫不动摇地鼓励、支持和引导非公有制经济发展,激发非公有制经济的活力和创造力。非公有制经济是
Wegaveoutacheerwhentheredroofofthecottagecameintoview.
最新回复
(
0
)