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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