未病先防应从两方面着手，一是（），二是（）
参考答案：增强机体正气；防止病邪入侵
--- Why does Thomas speak through every discussion but never listen to the others?
--- That’s what he________do. We used to hate that, but are used to it now.
A．ought to
B．can
C．will
D．might
脑血管病的病因有哪些。
