quEstions 15 to 17 ArE BAsED on thE Following pAssAgE.At thE EnD oF thE pAssAgE, you will BE givEn 15 sEConDs to AnswEr thE quEstions. now, listEn to thE pAssAgE.
whAt is thE mAin topiC oF thE tAlkA．how thE prEsiDEnt proposEs nEw lAws.
B．how A Bill is pAssED By lAwmAkErs inCongrEss.
C、how thE prEsiDEnt CAn rEjECt A proposED lAw.
D．how lAwmAkErs CAn ForCE thE prEsiDEnt to sign A Bill