(2014?福鼎市模拟)如图,BA1和CA1分别是△ABC的内角平分线和外角平分线,BA2是∠A1BD的角平分线CA2是∠

(2014?福鼎市模拟)如图,BA1和CA1分别是△ABC的内角平分线和外角平分线,BA2是∠A1BD的角平分线CA2是∠A1CD的角平分线,BA3是A2BD∠的角平分线,CA3是∠A2CD的角平分线,若∠A1=α,则∠A2013为(  )A.α2013B.α22013C.α2012D.α22012