折断面呈层片状的药材是（）
A.牡丹皮
B.桑白皮
C.杜仲
D.苦楝皮
E.肉桂
参考答案：D
History is( ) a subject that only lets us know something in history; it also tells us a lot of truth.
A．less than B．more thanC．no more than D．not more than
《张中丞传后叙》前面驳论采用了什么论据及其论证方法？
