quEstions 13 to 15 ArE BAsED on thE Following nEws.At thE EnD oF thE nEws itEm, you will BE givEn 45 sEConDs to AnswEr thE thrEE quEstions. now listEn to thE nEws.
ACCorDing to thE nEws, viEtnAm mAy BE willing to hElpAmEriCA mAinly BECAusE oFA．its ChAngED poliCy towArDsAmEriCA、
B．rECEnt intErnAtionAl prEssurE.
C．its DEsirE to hAvE thE us trADE EmBArgo liFtE
D、
D、thE impEnDing visit By A sEnior us militAry oFFiCEr.