呃逆的辨证主要是（）
A.虚实
B.气血
C.表里
D.阴阳
E.寒热
参考答案：A, D, E
—Who’s _____ woman in purple?
—Peter’s mother. She works in ______university.
A．a; a
B．the; an
C．a; an
D．the; a
膝折作用
