问题
单项选择题
(73) is the sending and receiving of the message by computer. It is a fast, low-cost way of communicating worldwide。
A．WWW
B．E-mail
C．TFTP
D．TELNET
答案
参考答案：B
解析：[要点解析] E-mail通过计算机发送和接收消息，它是一种在全世界范围内快速、廉价的通信方式。