阅读理解。

     Look! This is a picture of my family. My mother is a doctor. My father is a teacher. This is my brother. His name is Harry. He's twelve. He's a student. That is my grandmother. Ah, this is me. My name is May. I'm ten. I'm a student. Harry and I are in the same school. 

根据短文内容，判断下列句子正（T）、误（F）。

( )1. This is a picture of my family.

( )2. My mother is a teacher.

( )3. Harry is my brother.

( )4. Harry is twenty.

( )5. Harry and I are in the same school.

在定时电路中，调谐电路的作用是从（）码流中提出时钟。

A.NRZ

B.RZ

C.HDB3

D.CMI