quEstions 21～22 ArE BAsED on thE Following nEws From thEBB
C、or thE voA、At thE EnD oF thE nEws itEm, you will BE givEn 10 sEConDs to AnswEr thE two quEstions. now listEn to thE nEws.
whEn thE BirDs CAtCh thE Flu, it______.A．will killED thEm At onCE
B．just CAn hArm thE FEAthErs slightly
C、CAn BE FounD immEDiAtEly
D．soon sprEAD to humAn BoDiEs