in this sECtion you will hEAr EvErything onCE、only. listEn CArEFully AnD thEn AnswEr thE quEstions thAt Follow. mArk thE CorrECt AnswEr to EACh quEstion on your AnswEr shEEt.

quEstions 6 AnD 7 ArE BAsED on thE Following nEws itEm.At thE EnD oF thE nEws itEm, you will BE givEn i0 sEConDs to AnswEr EACh quEstion. now listEn to thE nEws.

ACCorDing to thE nEws, whEn DiDAmEriCA’ s First EnCountEr with A CAmpus mAssACrE oCCurA．in 1956.
B．in 1966.
C．in 1999.
D．in2006.