Both___     _ and ____   _ laughter do harm to your health.

A．burst out crying;burst into

B．to burst out tears;to burst into

C．bursting into tears; bursting into

D．bursting into crying;bursting out

术后肺不张的主要治疗方法是（）

A.应用广谱抗生素

B.雾化吸入

C.应用祛痰

D.吸氧

E.深吸气和咳嗽