---Excuse me, Sir. But smoking is not allowed here.

---Sorry, I didn’t see the sign. I’ll _______ my cigarette at once.

A．put out

B．put away

C．put up

D．put off

中老年肾病综合征常见的病因为

A．膜性肾病

B．糖尿病肾病

C．肾淀粉样变

D．骨髓瘤性肾病

E．过敏性紫癜肾炎