sentences:  Upset by this, Lois goes to a PTA meeting to complain about the textbook.Responding to her grievances, Principal Shepherd explains that the school cannot afford new textbooks due to the school's loss of federal funding under the No Child Left Behind Act as a result of their low test scores.Forced to make a decision on how to improve the scores and the school's overall performance, Principal Shepherd decides to expel the school's "dumbest" student, who is revealed to be Chris Griffin.