流媒体广告属于（）
A、邮件营销
B、移动营销
C、搜索引擎营销
D、博客营销
参考答案：B
Questions 11 to 18 are based on the conversation you have just heard
A．The shipping company.
B．The firm dealing with documents.
C．The travel firm.
D．The firm with a lot of people.
防水、防潮是为了保证集流环的（）性能。
A、防腐
B、通断
C、绝缘
D、机械
