读一读，选一选。

                                  Which dress?

     Nancy is 9 years old, and follows her own ideas.

    Today, she will go to a friend's birthday party. She is now choosing dresses. Blue, white and yellow,

Which one?

     Her father says, "The blue dress is pretty".

   Her mother says, "The white dress is pretty".

    Then, Nancy puts on the yellow dress and goes out.

1. Nancy is ________.

A. nine  

B. ten  

C. eleven

2. Nancy will go _________.

A. to school

B. to a birthday party

C. home

3. Nancy puts on the_____ dress.

电容器串联使用时，其等效电容量C的（）等于各串联电容器电容量的倒数之和。