· you will hEAr A ConvErsAtion ABout quAlity Control.
· For EACh quEstion 23-30, mArk onE lEttErA,B、orC、For thE CorrECt AnswEr.
·AFtEr you hAvE listEnED onCE, rEplAy thE rECorDing.

how to ChECk thE tAstEA、By EAting thEm.B、By EAting thEm AnD Doing ChEmiCAl AnAlysis.C、By Doing ChEmiCAl AnAlysis.