比一比,1 只鸭和 1 只鸡, (填>或=)谁重一些?6Y;n+m6W7c(~.p/L6n2g3N2o
6Y;n+m6W7c(~.p/L6n2g3N2o
2 只鸭/u-H4U9c,f1g;d,x:E5\:W1只鹅,4只鸡;x)l:X0?5u7Y2个鹅,1 只鸭4G0T'K)j4i6C7U1只鸡6Y;n+m6W7c(~.p/L6n2g3N2o