黄连药材横断面在紫外灯下木质部显
A.淡黄色荧光
B.淡蓝色荧光
C.金黄色荧光
D.棕褐色荧光
参考答案：C
会计职业道德的特征之一是维护国家和社会公众利益。（）
She had just finished her homework ______ her mother asked her to practise playing the piano yesterday.
A．when
B．while
C．after
D．since
