找出下列各组画线部分的发音不同的选项。① {#blank#}1{#/blank#} A.back B.fast C.have D.map
② {#blank#}2{#/blank#} A.school B.tooth C.choose D.look
③ {#blank#}3{#/blank#} A.cool B.ruler C.put D.blue
④ {#blank#}4{#/blank#} A.music B.club C.under D.umbrella
⑤{#blank#}5{#/blank#} A.tiger B.her C.officer D.doctor