管理员摘要：
They are having a math class. 他们正在上数学课。 My favorite subject is math. 我最喜欢的科目是数学。 Why am I interested in math? 我为什么对数学感兴趣呢？……
They are having a math class.
他们正在上数学课。
My favorite subject is math.
我最喜欢的科目是数学。
Why am I interested in math?
我为什么对数学感兴趣呢？