我会做奇特的算术题。
你也来编几道这样的算术题吧。
法 力 牙 鸟 鸦 宝 宀 玉
（答案不唯一）
— He hardly spent any time on his subjects, _____?
— _____, so he does badly in his lessons. [ ]
A. didn't he; Yes
B. did he; Yes
C. didn't he; No
D. did he; No
发生膝骨性关节炎的危险因素不包括（）
A.年龄在55岁以上
B.肥胖
C.家庭病史
D.文娱活动中突然转向
E.高度接触性运动
