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
2025-01-14
10
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] According to the passage, the chief purpose of explorers in going to unknown places in the past was ______.
选项
A、to display their country’s military might
B、to accomplish some significant science
C、to find new areas for colonization
D、to pursue commercial and state interests
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3912956.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
Onequestionthatworriesmanyvisitorstodefensivecarry.com,awebsitedev
[originaltext]Toooftenyoungpeoplegetthemselvesemployedquitebyaccid
[originaltext]M:Whenistheassignmentdue?Andwhattypeofreportdoyouwan
CustomsofficersataLondonairportyesterdayfound500,000poundsworthof
建筑安装工程费用项目按构成要素组成划分包括( )。A.人工费、材料费、施工机具
外科手术或创伤病人在应激反应中,激素分泌减少的是( )。A.生长激素 B.肾
银行内部控制应当渗透到商业银行的各项业务过程和各个操作环节,覆盖所有的部门和岗位
以下各项中,预防某企业员工贪污、挪用资金的最有效措施是()。A.记录应付
地形图中,地形类别包括( )。A.平地 B.荒漠地 C.丘陵地 D.山地
在正常使用条件下,最低保修期限为5年的工程是()。A.电气管线工程 B.装修工
最新回复
(
0
)