{{B}}pAssAgE two{{/B}} {{B}}quEstions 30 to 32 ArE BAsED on thE pAssAgE you hAvE just hEArD、{{/B}}

A．thEy smilE to CovEr EmBArrAssmEnt.
B．it is An unusuAl AnD EvEn suspiCious BEhAvior.
C．thEy smilE to show politEnEss.
D．it is An ExprEssion oF plEAsurE.