下列反应中,属于取代反应的是①CH3CH==CH2+Br2CH3CHBrCH2Br②C6H6+HNO3C6H5NO2+H2O ③CH3CH2OHCH2==CH2↑+H2O ④CH3COOH+CH3CH2OHCH3COOCH2CH3+H2O