题目内容

分组交换绝对优于电路交换?

A. 对
B. 错

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扩展——请同学结合所学谈谈报文交换和电路交换相比有哪些优缺点?

扩展——请同学结合所学谈谈分组交换的主要特点?

1. My best friend has moved, and now lives far _______ from me.

A. on
B. over
C. at
D. away

2. Can you pick _______ my glasses, please? They’re on the chair.

A. on
B. in
C. up
D. down