PleasefilltheblanksofthefollowingsentencefromWilliamArthurWard.Themediocreteacher（）.Thegoodteacher（）.Thesuperiorteacher（）.Thegreatteacher（）.
A.explains,tells,inspires,demonstrates
B.tells,explains,demonstrates,inspires
C.tells,demonstrates,explains,inspires
D.explains,demonstrates,tells,inspires
正确答案：B