与“疯牛病”和人类克雅氏病和Kuru病有关的病原体是（）
A.结核分枝杆菌
B.朊粒
C.噬菌体
D.HIV
E.HBV
参考答案：B
Restaurant owners have to know how ________ food. [ ]
A. make
B. making
C. to make
D. makes
DDC故障特点是什么？
