The suggestion that the meeting _________requires _________.

A．puts off; being considered

B．be put off; to be considered

C．should be put off; considered

D．is put off; being considered

患者，女，3岁，超声诊断为共同动脉干，其二维超声检查有什么特殊所见（）

A.两个大动脉显示平行并列

B.肺动脉显示明显大于主动脉

C.从各个切面图均不能显示独立存在的主肺动脉或其分支，只能从动脉干处显示其存在

D.肺动脉与左心室连接

E.肺动脉从冠状动脉起源