C. 寒水石                                                    D. 知母

27 ．以下不是用炒法制成的是 (       )

A. 大黄炭                                                    B. 地榆炭      

C. 血余炭                                                    D. 荆芥炭

28 ．药性偏寒的药物是 (       )

A. 攻下药                                                    B. 化湿药      

C. 行气药                                                    D. 消食药

29 ．属于十九畏的药对是 (       )

A. 川乌与草乌                                             B. 乌头与贝母      

C. 甘草与海藻                                             D.