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】______.
【C10】
选项 A、significant
B、imperative
C、indispensable
D、negligible
答案A
解析 短文最后一句说明，虽然目前清洁能源的负面影响不大，但随着使用量的增加，迟早也会产生重大影响。句中but表明后面句子的意义与trivial相反。significant：重要的，显著的；imperative：重要的；indispensable：必不可少的；negligible：可忽略不计的
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