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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【正确答案】 1、正确答案：语义错误，应把risen改为dropped／decreased。    
【答案解析】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。