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
2015-09-30
53
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.
The passage tells us that proof of life on Mars would______.
选项
A、make clear the complex chemistry in the development of life
B、confirm the suggestion that bacterial fossils traveled to Earth on a meteorite
C、reveal the kind of conditions under which life originates
D、provide an explanation why life is common in the universe
答案
C
解析
细节题。最后一段倒数第二句话说:对火星上过去或现在是否存在生命给出一个更确凿的、令人信服的回答,会给研究者提供产生生命条件的宝贵数据。这与C项的表述一致。而只有进一步证明生命在火星上不仅仅存在而且是独立产生的,才能进~步解释“生命在宇宙中是否普遍存在”这个谜,所以不能选D项。
转载请注明原文地址:https://kaotiyun.com/show/aaWO777K
0
在职攻硕英语联考
相关试题推荐
TheInternethasmadesomemensorichandambitiousthatEarthnolongerseemslargeenoughtocontaintheirfortunesoregos.
Youcan______abouttheseuniversitieseasilyifyouhavereadyaccesstotheInternet.
Asamother,Iunderstandthepowerfulbondbetweenaparentandchild.Ilovemyson,andIreallywoulddoanythingforhim.S
Asamother,Iunderstandthepowerfulbondbetweenaparentandchild.Ilovemyson,andIreallywoulddoanythingforhim.S
InancientGreek,thetermeuthanatosmeant"easydeath".Todayeuthanasia(安乐死)generallyreferstomercykilling,thevoluntar
"Couchpotatoes"inParagraph1referstothosewho______.Intermsofleisuretimeactivities,peopleintheUnitedStates__
Itisvirtuallyimpossibleto______thenumberofpeopleintheworldwhohaveacquiredanadequateworkingknowledgeofEnglish
Accordingtothepassage,thechiefpurposeofexplorersingoingtounknownplacesinthepastwas______.Atpresent,aprobab
Forcenturies,explorershaveriskedtheirlivesventuringintotheunknownforreasonsthatweretovaryingdegreeseconomican
随机试题
第一次鸦片战争时期,广东水师提督________战死虎门,________在吴淞西炮台以身殉国等。第二次鸦片战争时期,提督________、________(蒙古族)战死。中法战争期间,________多次击退法军,________率领清军和当地民众取得镇
在《饮酒(其五)》中,上下句之间有转折关系的是()
下列哪项不引起左心室肥大
A.中枢神经系统脱髓鞘疾病B.周围神经系统脱髓鞘疾病C.神经一肌肉传递障碍性疾病D.骨骼肌钙离子通道病变E.黑质致密区神经元缺失低钾性周期性瘫痪是
有关溢油动力学过程的扩展过程说法不正确的是()。
对文化遗产的保护,充足的资金保障是必不可少的条件。世界各国文化遗产保护先进国家和地区中,资金来源大致可以分为三个渠道:一是政府直接投资,二是政府通过发行专项彩券而进行的间接投入,三是来自社会团体或个人的投入。对上述文字理解不正确的是:
方法一[*]方法二[*]
有如下两个类定义:classAA{};classBB{AAv1,*v2;BBv3;int*v4;};其中有一个成员变量的定义是错误的,这个变量是
Youknowyoushoulddoit,otherpeopledoitallthetime.Maybeyou’vealreadydoneitbutitwasn’tverysatisfying,andyou’
A、Sheisdeterminednottogetinvolvedasothers.B、Sheisworriedmoreaboutherstudythananythingelse.C、Sheisalittlea
最新回复
(
0
)