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
36
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] At present, a probable inducement for countries to initiate large-scale space ventures is ______.
选项
A、international cooperation
B、scientific research
C、nationalistic reasons
D、long-term profits
答案
B
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3298397.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
1 Aboutthetimethatschoolsandothersquitereasonablybecameinterestedin
Losingweightiseasierwhenthereismoneyontheline,U.S.researcherss
Forsomeeducators,thereisnothingwrongwithfunandgames.Agroupcalle
A.阈电位 B.峰电位 C.局部电位 D.正后电位 E.负后电位可兴奋细
哪一项不是血枯瘀阻带下过少的症状A.带下过少,甚至全无,阴中干涩,阴痒 B.面
下列关于水蛭对血液系统的作用,错误的是A.抗血小板聚集B.抗凝C.促进纤溶D.降
开放式基金、封闭式基金的费率由()确定。A:基金托管人B:基金管理人C:基金
代谢性酸中毒最突出的症状是A.呼吸加深加快,有烂苹果味 B.唇干舌燥,眼窝凹陷
关于破产案件受理后、破产宣告前的程序转换,下列表述正确的是( )。A.如为债务人
(2012年)我国邮政管制的内容主要包括()。A.政策引导管制 B.市场准入管
最新回复
(
0
)