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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?

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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

3. If you get _______ the car, I’ll take you where you need to go.

A. over
B. on
C. into
D. around