请用英语为某校广播站写一则听英语讲座的广播通知，内容要点如下：

1．时间：10月1 5日下午3：30

2．地点：学校礼堂

3．讲座内容：美国的社会问题

4．主讲人：刚访美归来的陈军老师

5．出席对象：九年级全体学生

6．其他事项：自拟

注意：1．通知须用一段活包括所给内容要点，但不要逐条译成英语；

2．第6要点的内容须用3、4句话展开合理想象，作适当发挥；

3．词数80个左右，通知的开头和结尾已经给出，不计入总词数。

4．参考词语：听讲座attend a lecture

Boys and girls，

May I have your attention，please?

That's all．Thank you．

1、Boys and girls，

May I have your attention，please? There's going to be an English lecture on American social problems in our school hall at 3：30 p．m．on October 15．Mr. Chen Jun will give us the lecture．He's just come back from a visit to the USA．All the students of Grade 9 must attend the lecture．Please be there on time．Take careful notes while listening．After she lecture we'll have a discussion about it．Students from other grades who are interested in this topic are also welcome．

That's all．Thank you．