A make new materials B preserve wetland and animals C have clean air D have clean water E collect cigarette butts F collect disp

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问题 A make new materials
B preserve wetland and animals
C have clean air
D have clean water
E collect cigarette butts
F collect disposed oil
Joying placed the buckets at all public-access areas to______.

选项

答案E

解析 此句问的是Joying把一些桶放在公共场所的目的是什么?结合第一段的意思,我们知道这些桶是用来收集烟蒂的,故选E。
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