quEstions 29 AnD 30 ArE BAsED on thE Following nEws.At thE EnD oF thE nEws itEm , you will BE givEn 10 sEConDs to AnswEr thE quEstions.
now listEn to thE nEws.
oFFiCiAls BEliEvE thAt ______ ArE rEsponsiBlE For thE DEstruCtion oF nEArly 20,000 squArE kilomEtErs oF junglE.A．FirE DisAstEr
B．EnvironmEntAl ChAngE
C．logging AnD ClEAring lAnD For FArming
D．Air wArming