急性脊髓炎最常见于（）
A.学龄前儿童
B.学龄期儿童
C.青壮年
D.成年人
E.老年人
参考答案：C
There was an _________ look on his face when he knew the bad grade of his son.
A．worrying
B．exciting
C．worried
D．excited
桃核承气汤主治病证的病机是（）
A.下焦湿热
B.下焦蓄血
C.下焦蓄水
D.下焦实热
E.下焦痰浊
