___ of the earth must be ___ to the earth.(friend) 词形变化

问题描述:

___ of the earth must be ___ to the earth.(friend) 词形变化

Friends of the earth must be friendly to the earth.
“地球之友”应该对地球(的环境)友善.
不明白的再问哟,请及时采纳,多谢!