—My sports shoes are _______ out.

—How long have you _______ them? [ ]

A. worn; bought

B. wearing; had

C. wearing; bought

D. worn; had

朊毒体病的传播途径有哪些（）

A.进食感染宿主的组织或加工物

B.器官移植

C.空气传播

D.神经外科手术器械

E.注射尸体来源的人体激素