These topics are not duplication of lectures. There are also no direct answers for them. To finish them, students should look for data, make comprehensive analysis and think independently. The purpose of these topics is to train students’ research ability. It is not expected that they can do the research in depth because time is not very long.
　One topic will be completed by one group which is composed of 5 students,and one group should have a head. This may train students’ cooperation ability.