The only solution to rubbish problem for a nation which now spends more on wrapping food than it pays farmers to produce it, is

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问题 The only solution to rubbish problem for a nation which now spends more on wrapping food than it pays farmers to produce it, is recovering______the packaging materials for commer cial as well as for conservation reasons.

选项 A、on sale
B、on the spot
C、on a large scale
D、on all sides

答案C

解析 on a large scale“大规模地”;on sale“出售”;on the spot“当场;在现场”,用在句中语义不明确;on all sides“四面八方”,也不合适。
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