He likes music very much and I often see him _________ music.     [ ]

A. hear to            

B. listen to          

C. to hear            

D. to listen

用甲巯咪唑治疗甲亢，其用量、疗程为（）。

A.30～40mg/d，疗程一年可停药

B.30～40mg/d，病情缓解，FT₃、FT₄恢复正常后递减，疗程1.5～2年

C.30～40mg/d，症状消失，酌情停药

D.30～40mg/d，FT₃、FT₄恢复正常即停药

E.30～40mg/d，血中TSH正常即停药