选出不同类的一项。({#blank#}1{#/blank#})（1）A. first B.second C. three
({#blank#}2{#/blank#})（2）A. classroom B.play C. playground
({#blank#}3{#/blank#})（3）A. heavy B. high C. school
({#blank#}4{#/blank#})（4）A. on B.in C. me
({#blank#}5{#/blank#})（5）A.floor B. push C. swing
