People should be able to come to a decision about ions in the air if they ______.

A．The educational system and its administrators are partly to blame for the rise in the cheating.
B．The student who cheats must be at fault because the system is correct.
C．The 1960s vision of changing the world led students to conform.
D．Punishment for cheaters has always been severe in this country.

A．A change in the educational system will eliminate the need to cheat.
B．The problem of student cheating has its roofs in deeper problems.
C．Students do not cheat on essay tests.
D．Punishment is an effective method of stopping cheating.