第1题: [单项选择]Passage One Questions 26 to 28 are based on the passage you have just heard. A. To write a business letter. B. To provide proof of the deal. C. To find out the mistakes of a letter. D. To finish reading the letter quickly. 参考答案:C 答案解析:[听力原文] 26-28 How might you drag a good writer’s work down to the lower level Try the spell
第2题: [单项选择]TCP/IP参考模型包含网络层、传输层和应用层等。FTP和HTTP属于哪层的协议 A. 应用层 B. 网络层. C. 传输层 D. 物理层 参考答案:A 答案解析:[解析] TCP/IP参考模型在网络层定义了 IP协议,在传输层定义了传输控制协议TCP和用户数据报UDP,在传输层之上是应用层,它包括了所有的高层协议,并且总是不断有新的协议加入。应用层的协议主要有