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

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
People are grateful to Carter Dunham for his efforts to______.
选项
答案B
解析 此句问的是人们感谢Carter Dunham所做的什么努力?第二段谈到的是他为保护湿地和野生动物作出了自己的贡献，故选B。
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