Lucy likes playing        guitar, but Lily likes playing        chess.

A．/ ; /

B．the; the

C．/ ; the

D．the; /

触酶试验的阳性对照质控菌是（）

A.大肠埃希菌

B.金黄色葡萄球菌

C.铜绿假单胞菌

D.肺炎链球菌

E.肠球菌