电视台播放一部30集的动画片,要求每天播放的集数不同,最多播放( )天.
A:6
B:7
C:8
9-6=
① ____ A. season B summer C. spring
② ____ A. leaf B paint C snowman
③ ____ A because B. but C. hot
④ ____ A. green B tree C. flower