A、The loss of elm trees in the 1970s.B、Dutch butterfly disease.C、Air pollution

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问题

选项 A、The loss of elm trees in the 1970s.
B、Dutch butterfly disease.
C、Air pollution in Sheffield.
D、Extinction of their colony.

答案 A

解析

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[originaltext]W:Theairqualityinthiscityisawful![8]Thepollutionlevels