7[1]"It (economics) is a method rather than a doctrine,an apparatus of the mind,a technique of thinking which helps it spossessor to draw correctconelusions",John Maguard Keynes.James D.Gwarlney.Economics.Private an dpublic choice,9.
8[1]Zhang Qingqiu,RAO Guisheng.Research of Enhancing Practical Teaching and Training Qualified Talents[J].Education and Professional,2006,(35):185-186.
10Bouillion,L.M,Gomez,L.M.Connecting school and community with science learning:Real world prob-lems and school-community partnership as contextual scaffolds[].Journal of Research in Science Teaching.2001
