2. 外语
  3. "A better, richer and happier life for all our citizens." That’s the American【C1】______. In practice, it means living in a spaci

"A better, richer and happier life for all our citizens." That’s the American【C1】______. In practice, it means living in a spaci

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问题     "A better, richer and happier life for all our citizens." That’s the American【C1】______. In practice, it means living in a spacious, air-conditioned house, owning a car or three and maybe a boat or a holiday home, not to mention flying off to【C2】______destinations.
    The trouble【C3】______this lifestyle is that it consumes a lot of power. If everyone in the world started living like wealthy Americans, we【C4】______need to generate more than 10 times【C5】______energy each year. And【C6】______, in a century or three, we all expect to be【C7】______by an army of robots and fly into space on holidays, we are going to need a vast amount more. Where are we going to get so much power from?
    It is clear that continuing to rely on【C8】______fuels will have catastrophic results, because of the dramatic warming effect of carbon dioxide. But alternative power sources will affect the climate too. For now, the climatic effects of "clean energy" sources are trivial【C9】______those from greenhouse gases, but if we keep on using ever more power over the coming centuries, they will become ever more【C10】______.
【C6】
选项 A、if
B、though
C、while
D、so
答案A
解析 该空白处的答案不容易选择，需要考虑与后面句子意义的关系。使用机器人或到太空旅游肯定增加能源的消费，有因果关系，选择though或while不合适。如果选择so，则与上句的意义相矛盾，理由是使用众多的机器人和到太空休假不利于节省能源。第二段前几句已表明我们追求的生活方式是浪费能源，空白处后面的主句说明需要更多的能源，选择if最合适。
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