quEstions 23-30
·you will hEAr A tAlk on import rEgulAtions.
·For EACh quEstion (23-30), mArk onE lEttErA,B、orC、.
·AFtEr you hAvE listEnED onCE, rEplAy thE rECorDing.

thE proDuCt oF top-sElling isA．

A．omAt

B．

B．AmAt

C．

C．BmAt