问题：
[单选题]1. 收发电子邮件有两种方式，一种是通过WWW方式在线收发E-mail，另一种方式是选择一种收发电子邮件的工具，使用（）协议将邮件收取下来。
A、SMTP
B、POP3
C、.DNS
D、SNMP
参考答案：
B
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