问题描述:
1、The bag()()()(由……制成)plastics.
1、They are ()()()(努力保护)the environment.
3、Some of the swamps have()()(变得污染了)
1、They are ()()()(努力保护)the environment.
3、Some of the swamps have()()(变得污染了)
问题解答:
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