Students taking the course _____to finish their homework with the help of computers．

A．are encouraged

B．have encouraged

C．are encouraging

D．had been encouraged

45°右前斜位片，正常情况下心前缘自上而下为（）。

A.升主动脉、主肺动脉干、右心室圆锥部、右心室

B.升主动脉、右心室漏斗部、右心室、左心室

C.升主动脉、主肺动脉干、右心室、左心室

D.主肺动脉于、右心室圆锥部、左心房、左心室

E.主肺动脉干、右心室漏斗部、右心房、右心室