问题
单项选择题
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 commercial as well as for conservation reasons.
A. on sale
B. on the spot
C. on a large scale
D. on all sides
答案
参考答案：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。