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listEn to A pArt oF A DisCussion in A Biology ClAss.

BAsED on thE DisCussion, on thE "stEEping stonEs", whAt DoEs thE "stonE" rEFEr toA．thE stonEs in DEsErt.
B．thE FlywAys For pollinAtors.
C．pAtChEs oF plAnts.
D．CollECts oF FlowEring plAnts.