A．substitutes can take the responsibilities of parents.
B．it’s acceptable to let substitutes look after children.
C．perhaps substitutes can play a better role than parents.
D．parents should be cautious to choose substitutes.

A．Selective schools offer better instructional approaches to their students.
B．There are more essay exams in selective schools than other schools.
C．Their new teaching methods secure their graduates’ high salaries.
D．They don’t outperform other schools in terms of professors’ feedback.