3American Federation of Teachers. Sizing up State Standards[OL].http://www.aft.org/pubs-repor ts/downloads/t eachers/standards2008.pdf,2008.
4Bushaw,W,Lopez,S. Public Education in the United States:A Nation Divided[M].Phi Delta Kappa,2012.
5Loveless,T. How Well Are American Students Learning[M].The Brookings Institute,2012.
6Chingos,M,Whitehurst,G. Choosing Blindly: Instructional Materials,Teacher Effectiveness,and the Common Core[M].Brown Center on Education Policy at Brookings,2012.
7National Commission on Teaching and America's Future. America's Schools are about to be Hit by the Largest Teacher Retirement Wave in History Are We Ready[R].2008.
