—How about going for a picnic this weekend?

— Why not? _________.

A．I’ve got that

B．It’s up to you.

C．Have a good time

D．That’s all right.

与其它土壤相比，城市绿地土壤具有的特点是（）。

A.土体内侵入体丰富

B.土壤剖面层次被破坏

C.土壤有机质含量低

D.物理性状差，土壤碱度高

E.管道设施压制