The most important thing ______ we should consider is the first idea _____ he has talked about in the speech.

A．which; that

B．that; which

C．which; which

D．that; that

为避免房间隔的“假性失落”，应该选用哪个切面

A．心尖四腔心切面

B．胸骨旁四腔切面

C．剑下四腔心切面

D．胸骨旁心底短轴切面

E．剑下静脉长轴切面