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
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 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
TherewasnotanytobaccoinSpainuntil______.
Themoretimescientistsspenddesigningcomputers,themoretheymarvelatthehumanbrain.Tasksthatstumpthemostadvanced
Fromthepassagewecansee,theauthorisquite______withtheprospectoftheAsiaPacificEconomicCooperationforum.
Almostdaily,thegulfbetweeneducationandemploymentwidens.Careersofficerscomplainaboutasystemthatpresentsthemwith
【B1】Whiletherearealmostasmanydefinitionsofhistoryastherearehistorians,modernpracticemostcloselyconformstoone
Researcherssaidthatchildrendonotnecessarilydevelophealthybonesinareportthatstresses______consumptionofcalcium-
Manhasbeenstoringupusefulknowledgeabouthimselfandtheuniverseattheratewhichhasbeenspiralingupwardfor10,00
Man’spuzzlementandpreoccupationwithtimebothderiveultimatelyfromhisuniquerelationshiptoit.Allanimalsexistintim
Man’spuzzlementandpreoccupationwithtimebothderiveultimatelyfromhisuniquerelationshiptoit.Allanimalsexistintim
In1998,thetotalvaluetransactedine-commercewas______.
随机试题
下列配伍能有协同作用的是
A.利多卡因B.苯妥英钠C.异搏定D.乙胺碘呋酮E.溴苄胺强心苷类中毒所致室性心动过速首选
眼球所有的屈光界面,屈光力相对大的是
下列各项,适于采取补法的是
王某还处于管制执行期间,他的下列哪些行为是违反管制规定的行为?
先张法张拉台座的长度应根据()综合考虑确定。
教师在进行“二氧化碳的溶解性”教学时,设计了如下活动,教师给出实验研究方案,学生在教师的引导下,向盛满二氧化碳气体的软塑料瓶中加人约1/3体积的水,立即旋紧瓶盖并振荡,观察现象,解释原因。该活动中学生的学习方式属于()。
下列表述正确的是()。
A、Quiteoften.B、Seldom.C、FromtimetotimeD、Twiceayear.B妻子说“Ihaven’tseenafilmforhalfayear,”可断定他们很少去看电影。故答案为B。
ARVshaven’tbeenusedwidelytopreventHIVtransmissionorinfectionforlackofmoney.Lackofpreventionstrategiesandtre
最新回复
(
0
)