阅读小天地。根据表格内容，判断下列句子的正(T)误(F)。

( ) 1. Bob likes to read books, but Jenny doesn't like to read books.

( ) 2. Jenny and Lynn don't like to play ping-pong.

( ) 3. Bob and Lynn like to play checkers.

( ) 4. Bob and Lynn like to watch TV, but Jenny doesn't like to watch TV.

( ) 5. Bob, Jenny and Lynn all (都) like to play on the computer.

ISDN为了使通信网络内部的变化对终端用户是透明的，它必须提供一个标准的________。

A．用户接口

B．数据速率体系

C．网络接口

D．网络协议体系