2. 外语
  3. Man-made climate change is "unequivocal(毋庸置疑的)" and demands urgent action. Yesterday’s report from the Intergovernmental Panel o

Man-made climate change is "unequivocal(毋庸置疑的)" and demands urgent action. Yesterday’s report from the Intergovernmental Panel o

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问题     Man-made climate change is "unequivocal(毋庸置疑的)" and demands urgent action. Yesterday’s report from the Intergovernmental Panel on Climate Change underlined the former point,【C1】______discussions at the World Economic Forum in Davos last week demonstrated the growing consensus on the【C2】______. The challenge now is action.
    The IPCC’s warning is serious: temperatures are likely to【C3】______by about 3℃ by 2100, with a【C4】______of 2℃ to 4.5℃. The latter would be close to the difference【C5】______the hast ice age and today.
    Adaptation is going to be part of the response, not least【C6】______a substantial rise in temperatures is already on the way: the stock of greenhouse gases in the【C7】______now is already 50 percent【C8】______pre-industrial levels. But it is also essential to【C9】______growth in the stock, ideally to【C10】______it below 550 parts per million, which would【C11】______be double the pre-industrial levels.
    On present trends, the atmosphere is【C12】______to reach such a concentration in just three decades. To【C13】______levels rising further, emissions will need to be reduced【C14】______at least 50 per cent below what Sir Nicholas Stern called "business as usual" --【C15】______is, the continuation of historic trends--by then.
    The good news,【C16】______the Stern review of climate change, is that the economic【C17】______of achieving these objectives【C18】______be as little a 1 per cent of global gross product. However, the【C19】______news is that big changes to long-lived investment decisions will be required soon,【C20】______in the power sector.
【C12】
选项 A、possible
B、certain
C、likely
D、liable
答案C
解析 语义衔接题。本句句意为：按照目前的趋势，大气中温室气体的浓度只需要30年就可能达到这一水平。本题的形容词表示的含义为具有某种可能性。C) likely意为“很可能的”，符合文意，并且有be likely to的固定搭配，为正确选项。A) possible表示某件事可能发生、存在、可能成为、可实现的，强调具备令事件实现或发生的能力，选项D) liable意为“具有……倾向，容易造成”，主观性较强，因此这两个词都没C)likely合适。certain无此用法。
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大学英语四级

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