问题标题:
Treescan___waterinthesoil,sothestrongwindcan'tblowtheearthaway.选什么?ApreventBprotectCsaveDkeep
问题描述:

Treescan___waterinthesoil,sothestrongwindcan'tblowtheearthaway.选什么?

ApreventBprotectCsaveDkeep

汪芳子回答:
  D保持水土
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