Second year listening comprehension exercises

中国的发明创造 （新汉语第三册, P.180）

Click "Listen" to hear the sentences spoken	Questions (Place the mouse on the questions to view the answers)
Listen	When did the Chinese start producing paper?
Listen	Describe the problems of hand-copied books.
Listen	When was the printing technique discovered?
Listen	Describe the impact of the discovery of the gun powder on the world development.