确定归经学说的理论基础是（）
A.阴阳学说
B.脏腑经络理论
C.药性理论
D.药味理论
E.五行学说
参考答案：B
—Where’s her second son? I haven’t seen him for a long time.
—He _______ Maine looking for a place to work.
A．will go to
B．has gone to
C．had gone to
D．goes to
缺少含有下列哪一种物质的无机盐可能导致贫血
A．锌
B．铁
C．钙
D．钠
