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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
If it is proved that life indeed existed on Mars, researchers would get invaluable data about the conditions under which______.
选项
答案E
解析 首先，这道题的题干要求从选项中寻找一个能与which搭配的定语从句，那么只有B，E，F可以满足。而且选项是与Mars有关的，因此在选项中只能寻找与Mars有关的信息，只有E，F可以满足。通过E，F我们回原文锁定，原文第四段中描述的“would give researchers invaluable data about the range of conditionsunder which a planet can generate the complex chemistry that leads to life”，这里面的关键词chemistry与选项E是对应的，因此我们应选E。
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