读一读，根据短文内容，判断正(T)误(F)。

    I'm Lily. Five years ago, I was a student. My Mum was a teacher. She walked to workevery day. She

taught art. I was in her class.  I studied very hard. I was a good student. Now, my Mum is retired. I am a

teacher. I work in a primary school. I teach children art, too. I usually go to work by bike. My children

study very hard at school. I think I am a  good teacher.

( ) 1. Lily was a student five years ago.      

( ) 2. Lily's Mum taught her science.          

( ) 3. Lily was in her Dad's class.            

( ) 4. Lily's Mum walked to work every day.    

( ) 5. Lily works in a high school now.        

短时记忆的保存时间一般在（）以内。

A．30分钟

B．1分钟

C．2秒钟

D．30秒钟