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  3. 　　Up until a few decades ago，our visions of the future were largely—though by no means uniformly——glowinglypositive．Science and

　　Up until a few decades ago，our visions of the future were largely—though by no means uniformly——glowinglypositive．Science and

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问题 　　Up until a few decades ago，our visions of the future were largely—though by no means uniformly——glowinglypositive．Science and technology would cure all the ills of humanity，leading to lives of fulfillment and opportunity for all．
    Now utopia has grown unfashionable，as we have gained a deeper appreciation of the range of threats facing us，from asteroid strike to epidemic flu to climate change．You might even be tempted to assume that humanity has little future to look forward to．
    But such gloominess is misplaced．The fossil record shows that many species have endured for millions of years—so why shouldn’t we?Take a broader look at our species’ place in the universe，and it becomes clear that we have an excellent chance of surviving for tens，if not hundreds，of thousands of years．Look up Homo sapiens in the“Red List”of threatened species of the International Union for the Conservation of Nature(IUCN)and you will read：“Listed as Least Concern as the species is very widely distributed，adaptable，currently increasing，and there aye no major threats resulting in an overall population decline．”
    So what does our deep future hold?A growing number of researchers and organizations are now thinking seriously about that question．For example，the Long Now Foundation has its flagship project a mechanical clock that is designed to still be marking time thousands of years hence．
   Perhaps willfully，it may be easier to think about such lengthy timescales than about the more immediate future．The potential evolution of today’s technology，and its social consequences，is dazzlingly complicated，and it’s perhaps best left to science fiction writers and futurologists to explore the many possibilities we can envisage．That’s one reason why we have launched Arc，a new publication dedicated to the near future．
     But take a longer view and there is a surprising amount that we can say with considerable assurance．As so often，the past holds the key to the future：we have now identified enough of the long-term patterns shaping the history of the planet，and our species，to make evidence-based forecasts about the situations in which our descendants will find themselves．
  This long perspective makes the pessimistic view of our prospects seem more likely to be a passing fad．To be sure，the future is not all rosy．But we are now knowledgeable enough to reduce many of the risks that threatened the existence of eadier humans，and to improve the lot of those to come．
To ensure the future of mankind，it is crucial to____________．
选项 A、explore our planet’s abundant resources
B、adopt an optimistic view of the world
C、draw on our experience from the past
D、curb our ambition to reshape history
答案C
解析 细节题。按照出题顺序定位到第六段。该段中的As so often，the past holds the key to the future，即过去是预测未来的钥匙，draw on our experience from the past与其同义替换，因C项正确。A项“探测地球的丰富资源”、B项“对世界采取乐观看法”、D项“遏制我们的野心来改造历史”，原文均未提及。故本题选C。
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