How can we fight against pollution at school？
A. 打架
B. 战争
C. 与…作斗争
D. 敌对
查看答案
Pollution is a __________ (grow) problem.
It is a great example of ______ (recycle).
Look at the sky. It is so _________ (dust).
They want to do something about environment _______ (protect).
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