.He asked ____any elephants in the zoo the day before.

A,if did you see          B,if you had seen 

C,whether did you see     D,that you had seen

女性青春期开始的重要标志是（）

A.月经来潮

B.内生殖器官发育渐趋成熟

C.外生殖器官发育渐趋成熟

D.体形已渐发育为女性特有的体形

E.第二性征发育