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  3. For centuries, explorers have risked their lives venturing into the unknown for reasons that were to varying degrees economic an

For centuries, explorers have risked their lives venturing into the unknown for reasons that were to varying degrees economic an

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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 US 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 by going where no scientists had gone before.
    Today Mars looms(隐约出现)as humanity’s next great terra incognita(未探明之地). 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 experiment that only human 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(陨石)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.
A. bacterial fossils rode to Earth on a meteorite from Mars
B. their explorations were driven by commercial and political-military interests
C. promote the greater glory of Spain
D. demonstrate the powerful development of technology achieved by Americans
E. complex chemistry come into existence which lead to life
F. liquid water existed abundantly on Mars
G. believe that’s a signify commitment
Although Columbus accomplished significant science, it can be concluded that______.
选项
答案B
解析 首先，从语法上讲，该题的题干要求选择一个能用that引导的主语从句。那么只有B，F可以满足。选项F的内容跟题干是完全不搭配的，可以直接排除，因此应该选B。然后，我们从原文来印证选项B。在原文的第二段，“Although their missions blended commercial and political—military imperatives，the explorers involved all accomplished some significant science by going where no scientists had gone before，”题45就是从这句话里改写过来的，只不过强调的重点有轻微的变化而已。
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