选出不同类的一项。① {#blank#}1{#/blank#} A. tall B. son C. short D. long
② {#blank#}2{#/blank#} A. running B. diving C. bigger D. swimming
③ {#blank#}3{#/blank#} A. older B. young C. Strong D. heavy
④ {#blank#}4{#/blank#} A. shorter B. thinner C. stronger D. small