题目内容

A Thank-you Letter for Hospitality 感谢盛情招待 Write a letter of about 100 words based

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与互联网的层次结构对应，互联网使用的IP地址采用了层次结构，按逻辑结构进行划分，由网络号和主机号两个部分组成，共()位。

Showing Concern 表示关心 Write an e-mail of about 100 words based on the following situation: You phoned your friend Mary several times yesterday but she didnt answer your call at all Find out what happened and ask if she need your help. You should include the details you think necessary. Do not sign your own name at the end of the e-mail Use "Id Ming" instead. Do not write the address.

是一个A类地址，所以可以分配给一个A类网络。()

WWW通过统一资源定位符进行文档和资源的访问。()