pAssAgE onEquEstions 16 to 19 ArE BAsED on thE pAssAgE you hAvE just hEArD
A、By rEviEwing whAt hE hAs sAiD prEviously
B、By CompAring mEmorAnDums with lEttErs
C．By showing A mEmorAnDum’ s struCturE
D．By AnAlyzing thE orgAnizAtion oF A lEttEr