— Shall we run around the park or go for a bike ride?

—____. They are both good activities.                 [ ]

A. That's all right                                              

B. I'd prefer a bike ride    

C. Yes, I like them very much                            

D. It makes no difference to me

关于类风湿关节炎，不正确的是（）.

A.是一种非对称性多关节炎

B.属于自身免疫性疾病

C.病情进展呈慢性、侵袭性

D.发病机制尚不完全清楚

E.是造成人类致残的主要原因之一