The film Twilight, _______ leading characters are Bella and Edward, is a great hit.

A．who

B．whose

C．which

D．when

单发右位心(右旋心)的二维超声检查主要所见是

A．心房、心室位置正常，心尖朝左
B．心房、心室位置正常，心尖在右胸腔
C．心房反位，心室右袢(正常位置)，心尖朝右
D．心房正位，心室左袢(反位)，心尖朝右