Read and choose.(读一读,选一选。)
____
A. Hello! I'm Mike, I'm a student.
B. Good morning, boys and girls. I'm your teacher.
C. Hi! I'm a boy, I'm from America.
D. Hello! I'm Chen jie and I'm a girl.
设集合M=x|0<x≤3},N={x|0<x≤2},那么a∈M是a∈N的( )