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A.生物吸收养分
B.生物残体还归土壤
C.微生物分解生物残体
D.养分被生物吸收
A.It’s a pity.
B.You are welcome.
C.That’s just what I want!
D.Is it expensive?
A.康德
B.马克思
C.柏拉图
D.克罗齐
A.It’s no trouble at all.
B.That’s good.
B.I don’t think so.
D.That’s very kind of you.
A.It’s OK. I can manage.
B.It’s not very light.
B.I can help you with it.
D.Put it down on the ground.
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