下列哪种情况心排血量不增加
A．甲状腺功能亢进
B．维生素B1缺乏症
C．动-静脉瘘
D．贫血
E．二尖瓣关闭不全
参考答案：E
-----Did Alan enjoy seeing his old friends yesterday?
----- Yes, he did. He _____ his old friends for a long time.
A．hadn’t seen
B．didn’t see
C．hasn’t seen
D．wouldn’t see
供给法则
