---Where did you ______ our chemistry teacher?

---It was in the supermarket ______ I purchased moon cakes.

A．come to, where

B．come across, that

C．come across, where

D．come to, that

经皮吸收制剂中可作控释膜的材料是

A．铝箔

B．乙烯-醋酸乙烯共聚物

C．聚乙烯

D．聚氯乙烯

E．聚乙烯醇