— So you were in the supermarket _____ you heard a strange sound, right?

— That's true. I ran out as quickly as possible. [ ]

A. when

B. while

C. then

D. which

草食动物易发病，主要发生于夏季，突然发病，突然死亡，天然孔出血，血液凝固不良，煤焦油样，皮下结缔组织下出血性胶样浸润，脾脏肿大呈淤泥样，该病可能是（）

A．炭疽 

B．狂犬病 

C．破伤风 

D．结核病 

E．痘病