读单词，选出下列每组单词中划线部分发音不同的一项。① {#blank#}1{#/blank#} A. bus B. rule C. study D. club
② {#blank#}2{#/blank#} A. head B. bread C. heavy D. meat
③ {#blank#}3{#/blank#} A. cook B. foot C. soon D. cool
④ {#blank#}4{#/blank#} A. thin B. three C. that D. other
⑤{#blank#}5{#/blank#} A. rich B. sandwich C. cheap D. watch
