— I don't think it is good for animals to stay at zoos, ______?

— I agree with you.

[      ]

A. isn't it

B. don't I

C. is it

D. do I

制备口服缓控释制剂，不可选用（）

A.制成渗透泵片

B.用蜡类为基质做成溶蚀性骨架片

C.用PEG类作基质制备固体分散体

D.用不溶性材料作骨架制备片剂

E.用EC包衣制成微丸，装入胶囊