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  3. Air quality in Britain has improved considerably in the last thirty years. Total emissions of smoke in the air have risen by ove

Air quality in Britain has improved considerably in the last thirty years. Total emissions of smoke in the air have risen by ove

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问题 Air quality in Britain has improved considerably in the last thirty years. Total emissions of smoke in the air have risen by over 85 percent since 1950.
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答案语义错误，应把risen改为dropped／decreased。
解析 第一句说“英国的空气状况在过去的三十年里有了相当大的改善”，所以第二句的意思应该是“烟雾排放量下降了85％”，而不是上升了。
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