— Mum, could you buy me a dress like this?

— Certainly, we can buy ________ one than this, but ________ this.

A. a better; better than                B. a worse; as good as         

C. a cheaper; as good as               D a more important; good as

大量凝固性血胸，在其出血停止后数天内，应争取何种手术?()

A．闭式胸膜腔引流术

B．胸膜腔穿刺术

C．肺纤维板剥出术

D．剖胸清除积血和血块

E．胸廓改形术