The tested children come from the Experimental Kindergarten of Northeast Normal University, the Longcai kindergarten from Jiutai, and Bright bilingualistic kindergarten from Meihekou.

• 我从东北师范大学实验幼儿园、九台市龙才幼儿园、梅河口的光明双语幼儿园中分别随机选取了小、中、大各一个班的儿童作为被试。