首页
登录
职称英语
For centuries, explorers have risked their lives venturing into the unknown
For centuries, explorers have risked their lives venturing into the unknown
游客
2023-12-23
19
管理
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 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 once 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. [br] 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
转载请注明原文地址:https://tihaiku.com/zcyy/3298400.html
相关试题推荐
Forcenturies,explorershaveriskedtheirlivesventuringintotheunknown
Forcenturies,explorershaveriskedtheirlivesventuringintotheunknown
Forcenturies,explorershaveriskedtheirlivesventuringintotheunknown
Forcenturies,explorershaveriskedtheirlivesventuringintotheunknown
FlatswerealmostunknowninBritainuntilthe1850swhentheyweredevelope
FlatswerealmostunknowninBritainuntilthe1850swhentheyweredevelope
FlatswerealmostunknowninBritainuntilthe1850swhentheyweredevelope
FlatswerealmostunknowninBritainuntilthe1850swhentheyweredevelope
FlatswerealmostunknowninBritainuntilthe1850swhentheyweredevelope
Extract3Foratleastfivecenturiesattemptshavebeenmadetodeviseasy
随机试题
演讲的人原来是我的一位老同学。(turnout)Thelecturerturnedouttobeoneofmyoldclassmates.
California,longaleaderoncleanairandotherenvironmentalissues,isdo
汉乐府民歌以战争为题材的代表作品有()A.《战城南》 B.《平陵东》 C.
设函数φ(x)具有二阶连续导数且φ(0)=0,并且已知yφ(x)dx+[sinx
在传染性非典型肺炎救治中医疗机构履行下列职责()A.及时、如实报告疫情
共用题干 患儿女,6个月。主因咳嗽,咳痰2天,喘息伴发绀1小时入院,入院体温3
台湾和大陆和平统一后,台湾特别行政区可享受比香港、澳门特别行政区更高的自治权利,
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
第三方物流也叫()。A.契约物流 B.配送中心物流 C.仓储企
最新回复
(
0
)