－Why do you like the dolphins very much?

－_______ they are interesting. [ ]

A. For

B. Why

C. So

D. Because

老年人和儿童在应用抗菌药时，最安全的品种是（）

A.氟喹诺酮类

B.氨基糖苷类

C.β-内酰胺类

D.氯霉素类

E.磺胺类