同学你好，该知识点来自沪江网校《英语零基础直达大学六级【8月班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
and在这里也是连接两句话，连接的是The next man who approached him was selling watches and pens这句话和when the writer looked at one, it looked genuine，其中

The next man who approached him was selling watches and pens这句话里，who approached him是从句，主句是The next man was selling watches and pens

when the writer looked at one, it looked genuine 这句话里，when the writer looked at one是从句，it looked genuine是主句

祝同学学习进步~