● you will hEAr A tAlk givEn By juliEt shArmAn.● For EACh quEstions 23--30, mArk onE lEttErA,
B、orC、For thE CorrECt AnswEr.●AFtEr you hAvE listEnED onCE, rEplAy thE rECorDing. rEliABility improvED stEADily
A、

A、From 1993 to 1997

B、

B、BEtwEEn 1993 AnD 1995

C、

C、From 1995