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我国经济特区的窗口作用，主要表现为（）

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A good lifestyle. means one can______.

Sleep helps brain to______.

We enjoy sports in one way or another. But can you explain why having sports is such a common phenomenon in the modern world？ Write an essay and give three reasons:
1) it can be convenient,
2) it brings fun, and
3) you can enjoy it without participating because there are spectator sports to be enjoyed.
You should write 160-200 words on ANSWER SHEET 2.

宽带ISDN的协议参考模型每个面分3层，即物理层、ATM层和【】。