— Can you remember this park? We _____ here.    

— Sure. But now I _____ in that swimming pool. [ ]

A. are used to take a walk, am used to swim 　　

B. are used to taking a walk, am used to swimming 　　

C. used to take a walk, used to swim

D. used to take a walk, am used to swimming

藻酸盐类印模材中酚酞的作用是（）

A.指示反应的过程

B.稀释剂

C.增稠剂

D.填料

E.缓凝剂