whAt is impliED By sAying "A lAyEr oF soil ACts As A spongE" (pAr
A、2)
A、soil CAn BE usED to ClEAn things.
B．soil CAn storE wAtEr AnD givE it up whEn nEEDED、
C．soil is All ElAstiC mAtEriAl.
D．soil CAn proviDE wAtEr.