肺源性心脏病最常见的病因是()
A．机化性肺炎
B．慢支、肺气肿
C．支气管扩张
D．肺结核
E．矽肺
参考答案：B
You ________ your son to watch TV for too long hours! See, Mr. Morrison called that he didn’t finish his homework yesterday.
A．are always permitting
B．have permitted
C．permit
D．permitted
胃大部切除术后，输出段梗阻可有（）
A.右上腹突发剧痛，局部有腹膜刺激征
B.上腹饱胀，呕吐食物和胆汁
C.上腹部突发剧痛，频繁呕吐、不含胆汁
D.进食后心悸、出汗、恶心、腹泻
E.剑突下持续烧灼痛，进食后加重，抗酸剂无效
