If more short journeys were made by bicycles, energy could be saved and pollution ______.

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问题 If more short journeys were made by bicycles, energy could be saved and pollution ______.

选项 A、declined
B、reduced
C、dropped
D、decreased

答案D

解析 decline衰退，下降；reduce减少，降低(程度)；drop下降，降低；de-crease减少，减弱，减轻。

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