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
28
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
MercedesestatecarsandFiatrunarounds(轻便小汽车)arebeingusedtotestupto
PassageOneWhatdidthereligionaskwomentobeexceptsometexts?Itasked
费用支出最高的企业是()。 A.甲企业B.乙企业C.丙企业D.丁企
描写生活在同一领域的人民在旧社会和新社会的不同生活遭遇,歌颂了共产党和人民政府关
某上市公司2017年2月发行股份购买资产,以下特定对象认购的股份应予锁定36个月
将凝胶电泳与免疫化学方法结合起来的电泳技术为A.转移电泳B.等电聚焦电泳C.琼脂
下列检测无助于自身免疫病诊断的是A.抗乙酰胆碱受体检测 B.抗dsDNA抗体检
双母线接线方式下,一组母线电压互感器退出运行时,应加强运行电压互感器的()。巡视
变电站生产准备:工程投运前(),运维单位组织完成变电站现场运行专用规程的
政策性风险属于()。A.系统性风险 B.非系统性风险 C.可分散风险 D
最新回复
(
0
)