题目内容：
以下结构体类型变量的定义错误的是（ ）。A、#define STU struct student
STU {float height; int age; }std1;
B、struct student {float height; int age; }std1;
C、struct {float height; int age; }std1;
D、struct {float height; int age; }student;
struct student std1;
参考答案：