A:吹气时纸条向上飘
B:用吸管从瓶中吸饮料
C:吹气时纸片向下凹
D:吹气时A管中水面上升
84÷{234
268+735=____
--- No, she went to the party.
要作用,下列选项不属于联合国职能范围的是( )