A:CH3CH(CH2Br)2
B:CH3CH2CHBrCH2Br
C:H3CHBrCHBrCH3
D:CH2BrCBr(CH3)2
— Why does Yun Tianming look so tired out these days?
— He pracitses basketball every day so that he could ____ for the Slam Dunk Contest.
①平定“七国之乱”
②颁布“推恩令”
③形成“中朝”“外朝”体制
④建立对地方高官的监察制度