从美国来的客座教授john smith 要给你系学生做一个讲座。请写一则有关于这个讲座通知，通知的内容包括以下几个方面：
(1)讲座的主题和主要内容
(2)讲座的时间和地点
(3)讲座的参加者
(4) 要求本专业的学生讲座后留下进行讨论

A．he no longer found his work interesting
B．he wanted to live a peaceful life in the countryside
C．he wanted to find out more about the Third World
D．he thought living in a small community would be rewarding

A．he was searching for the impossible
B．all the villages were exactly the same
C．the villagers made him feel confused
D．the villagers asked him a lot of questions