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计算机网络有哪些数据交换类型？

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互联网是如何扩展成数以亿计的主机结构的？（详细说明主机的结构和层次组织，并计算出每个层次的实体数量。）

4.1.Thanksgiving Day is a festival shared by the United States and Canada. It was originally created by the American people to thank God for the good harvest and the Indians for their help.

A. 对
B. 错

4.2.Jack-o '- lantern is a hallmark of Halloween.

A. 对
B. 错

4.3.After a lunar year, people began to prepare for the new year.

A. 对
B. 错