— Could you play the guitar when you were 8 years old?

— _____. [ ]

A. Yes, I could.

B. No, I can't.

C. Yes, I can.

D. No, I won't.

经淋巴系统蔓延的病原菌是（）

A.链球菌

B.葡萄球菌

C.淋病奈氏菌

D.沙眼衣原体

E.结核杆菌