题干

在人类活动所排放的温室气体中,二氧化碳所占比例最大,对其处理方式一般是捕捉后封存。目前,科学家正致力于二氧化碳回收再利用的研究,利用它与氢气反应,产生甲醇,再与其他物质反应,生成乙烯,从而为工业提供原材料,使二氧化碳转变为廉价而充裕的可再生能源。这一研究思路体现了科学家力图通过科技创新(   )
①生产出之前所没有的物质形态     ②解决人类社会可持续发展提出的新课题   
③解决不适应生产发展要求的高耗能问题    ④探索解决人与自然矛盾的可行路径

A:①②

B:②③

C:②④

D:③④

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C

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    Ben, at the age of 23 ,was the youngest man to ski solo to the North Pole. He dragged a 180-kilogramme sledge (雪橇) over 1,420 miles through the worst Arctic conditions. This year, Ben plans to ski solo from the Antarctic coast to the South Pole and back in the autumn, carrying all his supplies on his sledge.

    Ben Saunders was fired after persuading the firm to support his disorganized first adventure. “Everything that could go wrong did go wrong. We didn't get to the Pole, so we had no media interest. No one heard about it.”

    “People said it was impossible for me to get to the Pole. I said, “No, I can get there,” and I did. Self-belief, I see it as being a bit like a muscle — it's my belief that the more you stretch yourself the stronger it gets. If you never do anything that's uncomfortable or risky then your self-belief gets weaker. So that's one of the lessons I've figured out along the way.

    “My Antarctic adventure is just practicable and that's what is exciting to me. If I knew I could do it without too much bother, I wouldn't be interested." Why? “Personally I'm attracted by the human performance element to it. Not that long ago, running a marathon was seen as the top point of human attempt, and now I wouldn't be that surprised if my mum said she was going to run one."

    People's horizons are changing. “I'm not particularly gifted. I've just chosen this one goal to achieve and I've been working hard to realize it. And that's the thing that attracts me: with enough training and enough determination, enough focus and preparation, how far can we go? And I dont think I've found out yet.”