A:①②
B:②③
C:②④
D:③④
This boy is Peter .He is from America.He is ten years old . His hair is yellow.Peter can play basketball. This is his school.It's very big. There are forty students in his class. Miss White is his English teacher. Peter is good at English.
①将推动物价上涨,引发通货膨胀 ②源于中国经济持续快速健康发展
③反映人们对未来收入预期较乐观 ④说明社会收入分配差距正在扩大
绝对值不大于3的所有整数的和是( )