BMI
参考答案：
BMI即体重指数BMI=体重(kg)/身高(m)2。
CPU、存储器、I/O设备是通过什么连接起来的
A．接口
B．总线
C．系统文件
D．控制线
________ a teacher, John thinks that his main duty is to help the students to become better learners. [ ]
A. As
B. By
C. About
