下列哪项不是锌的生物学作用（）

A.参与辅酶A和辅酶Q的合成

B.可作为多种酶的功能成分或激活剂

C.促进机体生长发育

D.促进维生素A的正常代谢和生理功能

E.参与免疫功能过程

-----I haven’t seen Gina for a week.

-----Oh! She _______ Mt. Huang with her friends. She ________there twice.

A. has gone to; has gone     B. has gone to; has been  C. has been to; has been