阅读理解。

     David and his brother Grey don't go to school in the morning. They go to school after lunch, at one

o'clock. They have math at one-fifteen, David likes math because it's interesting. Greg doesn't like math.

David and Greg have P.E. after math. They like the teacher, Mr. Green and they like P.E. because it's

fun. But Greg's favorite subject is art and David's favorite is music. He plays the piano and the violin.

根据短文内容判断正（T）或误（F）。

( )1. David and Greg have P.E. after math.

( )2. David plays the piano.

(     )3. They go to school in the morning.

(     )4. They don't like P.E. because it's boring.

(     )5. Grey likes his art class.

以下论述正确的是( )。

A．在简单中断时，中断是由其他部件完成，CPU仍执行原程序

B．在中断过程中，又有中断源提出中断，CPU立即实现中断嵌套

C．在中断响应中，保护断点、保护现场应由用户编程完成

D．在中断响应中，保护断点是由中断响应自动完成的