A．teach the students how to write an essay on preventing polystyrene from harming the environment
B．inspire the students to do something to persuade the Board of Education to change its decision
C．ask the students to work hard together to fight against the decision made by the Board of Education
D．let them know the power and influence of the effective essay written by Thomas Paine in the past

A．The majority of the students in the two schools found it acceptable to pay a bit more to eat their lunch from paper trays.
B．Scientific evidence indicates that polystyrene can seriously break down the protective ozone layer of the atmosphere.
C．The Board of Education changed its decision immediately after Vogt and her classmates presented their findings to it.
D．The Board of Education at last voted and decided to change to paper trays in these two schools from February 1, 1989.