降低肺心病患者肺动脉高压的关键治疗是
A．呼吸兴奋剂
B．支气管扩张剂
C．强心剂
D．氧疗
E．利尿剂
参考答案：D
As for how to promote public education, Professor Li gave us a lot of suggestions which _____ reasonable and practical.
A．appeared
B．sounded
C．looked
D．listened
“履霜，坚冰至”的典故是（）。
A.桓公宠姬乱齐国
B.献公宠姬乱晋国
C.吕后篡权
D.以上都不对
