"Saying is one thing and writing_____," the teacher writes on the blackboard.[      ]

A. another

B. the other

C. others

D. the others

房间隔缺损杂音产生的原理是

A．血流通过缺损口

B．主动脉瓣相对狭窄

C．肺动脉相对狭窄

D．三尖瓣相对狭窄

E．二尖瓣相对狭窄