er.字母组合发音,在什么情况下发什么音?答:自然拼音拼读练习表第一天:a , e, i , o, u, a_e, e_e, i_e, o_e, u_eAa : mat map bag cat hat fan bat appleEe: egg well red pen net hen bed bellIi: lick six bib pig pin kiss ink hillOo: ox on octopus box sock operate ostrichUu: sun umbrella cup bus nut gun uncle ...