A、BECAusE thE hot Air hAs to rEACh A CErtAin tEmpErAturE.
B、BECAusE thE housE is vEry Big.
C．BECAusE tErmitEs try to EsCApE By hiDing in wooDEn BEAms.
D．BECAusE tErmitEs mAy survivE For A Full six hours.