下列说法不正确的是（ ）
A：各边都相等的多边形是正多边形
B：正多形的各边都相等
C：正三角形就是等边三角形
D：各内角相等的多边形不一定是正多边形
——I often have hamburgers for lunch.
——You'd better not. It's bad for you _________ too much junk food.
