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
2012-08-22
22
问题
For centuries, explorers have risked their lives venturing into the unknown for reasons that were to varying degrees economic and nationalistic (国家主义的). 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 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 before.
Today Mars looms (隐约出现) as humanity’s next great terra incognita (未探明之地). And with growing emphasis on international cooperation in large space ventures, it is clear that imperatives (需要, 必要) 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.
What is the main goal of sending human missions to Mars?
选项
A、To find out if life ever existed there.
B、To see if humans 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
综合判断题。本题问及人类登上火星的主要目标是什么。C、D容易排除。那么到底是为了发现火星上是否存在生命还是看看人类是否能够在火星上生存呢?文章最后一段讲,因为越来越多的证据证明,火星上是否曾经存在过生命并且是否持续到现在这个问题已经变得很突出了。对火星是否存在生命做出一个更确凿的令人信服的回答,会给研究者们提供宝贵的产生生命条件的数据。如果可以确定生命在火星和地球上是分别独立产生的,就会进一步解开“生命在宇宙中是否普遍存在”这个谜。综上所述,人类登上火星的主要目标是为了发现火星上是否存在生命。所以选A。
转载请注明原文地址:https://kaotiyun.com/show/HFXO777K
0
在职攻硕英语联考
相关试题推荐
Themultibillion-dollarinternationalpharmaceuticalindustryhasbeenaccusedofmanipulatingtheresultsofdrugtrialsforfi
IwasluckybecauseIhadturnedmybackon______,pursuinginsteadcommon-sensereality.
Thereisanimmenseandjustifiedprideinwhatourcollegeshavedone.Atthesametimethereisagrowinguneasinessaboutthe
Inaglobaleconomythathasproducedmoredramaticupsanddownsthananyonethoughtpossible,Asiamaybe______anotherdishear
Manyanimalsareonthe______ofdisappearingfromthefaceoftheearthandzooscanprovidethemwithasafeplacetolivean
NewYear’sdetoxproductsthatpurporttoridthebodyofharmfulchemicalsaccumulatedthroughseasonalover-indulgenceareaw
Ofthethousandsofdifferentkindsofanimalsthatexistintheworld,manhaslearnedtomakefriendswithanenormousnumber.
DetailedstudiesofthetribebythefoodscientistsatAtheUniversityofLondonshowedthatgatheringisamoreproductivesou
CantheInternethelppatientsjumpthelineatthedoctor’soffice?TheSiliconValleyEmployersForum,asophisticatedgroupo
A、Marywillshowupontime.B、Maryisalwayslate.C、Maryhasagoodexcuseforherabsence.D、Marywaskeptbusywithwork.B男
随机试题
铣削尖齿形离合器,分度头主轴必须仰起一个角度α,其中cosα=tan(90°/z)cot(θ/2)。
患者女,26岁。孕37周,因“鼻塞2个月,间断血涕3天”就诊。体检发现患者双上颈多个肿大淋巴结,最大径约3cm,行直接鼻咽镜检查发现右侧鼻咽咽隐窝消失,局部可见菜花样新生物,活检证实为鼻咽低分化鳞癌。患者诉近几天颈部肿块增大明显,鼻塞症状加重,关于下一
A、足三里B、阳陵泉C、悬钟D、足临泣E、公孙八脉交会穴中通带脉的是
患者,男性,35岁,左胸外伤后出现呼吸困难,疼痛,面色发绀,气管右移,左侧呼吸音消失并伴有皮下气肿,应初步考虑为
《中华人民共和国对外贸易法》中所称的对外贸易是指货物的进出口。()
行政程序的基本原则是()
现有一个无限容积的杯子,先加入1克糖,再加入2克水,再加入3克糖,再加入4克水……如此反复,问杯子中糖浓度趋近于多少?
Ihavenodoubt________mostofthestudentsinourclasscanpassthefinalexamination
WhichofthefollowingisNOTsafewhenyouareout?Themainideaofthetextis______.
Thelittleboydemonstratedaremarkable_________ability;hiscalculationwithfigureswasfasterandmoreaccuratethananyon
最新回复
(
0
)