Mid-Autumn Festival is _______ important festival in China.( )
A:a
B:an
C:the
两个数相乘,一个因数扩大10倍,另一个因数也扩大10倍,那么积( )
Our teachers were very happy because ______ failed the exam.
下列与青春期第二性征的发育直接有关的是( )。