I can’t sing ________ dance. Would you please teach me _________first ?

A．and, to dance

B．or, dancing

C．or, to dance

D．and, dancing

川牛膝可用于治疗

A．月经不调、痛经、经闭

B．产后瘀阻，关节痹痛，跌打伤痛

C．小便不利，淋浊涩痛

D．牙龈肿痛，口舌生疮，头痛眩晕

E．吐血、衄血、尿血