单选题：Ryan, with the help of others, is fulfilling his dream of he

题目分类：综合类
题目类型：单选题
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题目内容：

Ryan, with the help of others, is fulfilling his dream of help African people to __________ A．make new materials
B．preserve wetland and animals
C．have clean air
D．have clean water
E．collect cigarette butte
F．collect despoiled oil

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