The bike is very old, _______ he likes it very much.[ ]

A. and

B. but

C. so

D. or

鉴定苦杏仁时所依据的香气来自于

A．苦杏仁苷

B．野樱苷

C．苯羟乙腈

D．苯甲醛

E．氨氰酸