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
49
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] What is the main goal of sending human missions to Mars? ______
选项
A、To find out if life ever existed there.
B、To see if humans 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
转载请注明原文地址:https://www.tihaiku.com/zcyy/3298398.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
[img]2022m3x/ct_ve01202001m_eillist_0993_220329[/img][br][originaltext](Aimee
ItisamiraclethatNewYorkworksatall.Thewholethingisunbelievable.
拟对某地区(含城镇和乡村)实施国家统一的城乡住户调查,基于此,回答下列问题:
砂仁入汤剂宜()(2004)A.烊化 B.包煎 C.另煎 D.后下
根据皮亚杰的理论,感知运动阶段儿童认知发展主要体现在_______和______
患者男性,62岁。因肺炎用抗生素连续治疗,近日发现口腔黏膜有白色附着物,用棉签拭
学生迁移的基因理论有()。A.形式训练说 B.奥苏伯尔的认知观 C.经验类
“理万金分文不沾”体现的会计职业道德是()。A、参与管理 B、廉洁自律 C、
根据《中华人民共和国水法》,水资源规划按层次分为()规划。A、综合B、专业C
【教材变动】根据《建设工程工程量清单计价规范》(GB50500-2013),中标
最新回复
(
0
)