以下关于 TCP/IP 协议的描述中，哪个是错误的______。A．地址解析协议 A
题型：单项选择题
问题：
以下关于 TCP/IP 协议的描述中，哪个是错误的______。
A．地址解析协议 ARP/RARP 属于应用层
B．TCP、UDP 协议都要通过 IP 协议来发送、接收数据
C．TCP 协议提供可靠的面向连接服务
D．UDP 协议提供简单的无连接服务
题型：单项选择题
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A. Happiness Now 
B. Balancing Work & Life
C. Shift Happens D. The Secrets of Relationships
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A. to make friends easily B. to improve their quality of life
C. to find a better job 
D. to achieve their work success.
67. If you want to buy two copies of Balancing Work & Life and one copy of Happiness Now online, how much would you have to pay?
A. $29 B. $23.20 C. $26.50 D. $22.40