Beethoven was walking in the street _______ he heard someone ________ his music. [ ]

A. before, play

B. after, playing

C. when, playing

D. while, to play

重大动物疫情由（）按照国家规定的程序，及时准确公布；其他任何单位和个人不得公布重大动物疫情

A.国务院兽医主管部门

B.属地兽医主管部门

C.省级兽医主管部门

D.县级以上兽医主管部门

E.当地兽医行政主管部门