与老年性白内障的发生密切相关的因素有（）。

A.生理性老化

B.代谢异常

C.紫外线照射

D.全身及眼部疾病

E.中毒

– Where ______________?

– An art exhibition. I think it’s really worth _______ and we can learn a lot from it.

A．have you gone; visiting

B．have you been; visiting

C．have you gone; visit

D．have you been; visit