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17.-We experienced a freezing cold winter this year.
-Oh,yes.I think ______ is the power of global warming that the climate goes from one extreme to the other.(  )
A.suchB.thisC.soD.it

分析 -今年我们经历了一个寒冷的冬天.
-哦,是的.我认为全球变暖如此强大以至于天气从一个极端变到另一个极端.

解答 答案:A.
考查指示代词.根据句意判断,主句与从句之间是因果关系,所以理解为"如此…以至于…,"such和so有这个意思,故可排除B和D,such在强调程度,"这样,非常,如此程度",可在句中做主语,so无此用法,故选A.

点评 考查指示代词的用法.指示代词such可意为"这样,如此程度"在句中单独作主语.

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