A:物价上涨必然导致通货膨胀的出现
B:物价总体水平影响着人民的消费水平
C:物价上涨必然导致替代商品价格下降
D:物价上涨必然导致商品的供应量增加
—Because his classmates often make fun of him because of his stammer(口吃).