As a result of the fog haze weather, nowadays many people are longing to live ______ the air is fresher.

A．that

B．when

C．where

D．in which

4岁女孩，自10个月起出现口唇青紫，哭闹后加剧，会走后常有蹲踞，平日少动。查体：胸骨左缘3、4肋间闻及Ⅲ级收缩期杂音，无震颤。股动脉血氧饱和度85%。胸部X线片：心脏轻度增大，有心室增大．肺纹理减少，肺动脉段凹陷。心电图示右心室肥大。最可能的诊断是

A．单纯肺动脉瓣狭窄

B．义森曼格综合征

C．法洛四联症

D．肺动脉瓣狭窄+房间隔缺损

E．原发性肺动脉高压