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
47
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
Theplotto______thisgreatpoliticalleaderhadstartedlongbeforehewasac
Hereisalistofroutinemaintenanceyoushouldbeperformingonyourcompu
患者体弱而瘦,头晕眼花,气短疲乏,脘腹坠胀感,余溺不尽,久泄脱肛,脉虚,可诊为:
同时取头、面、胸、腹部腧穴,最适宜的体位是A.仰卧位 B.俯卧位 C.侧卧位
厚朴的功效为A.行气燥湿,消积攻下 B.行气燥湿,下气除满 C.行气燥
下列哪项检查是诊断溶血性贫血的直接证据()A.血清未结合胆红素升高B.网织红细
1996-108.扁豆主治 A.脾虛泄泻B.暑湿吐泻C.两者均是D.两者
测量主要是一种收集资料数据的过程,是根据某种标准和一定的操作程序,将学生的学习(
在实施WAIS-RC的图画填充分测验时,下列说法中正确的是()。 A.仅第一图
在以下检查中最可能见到异常的是A、心理测试 B、CT C、mRI D、EE
最新回复
(
0
)