In the passage the author's attitude towards "mixed—ability teaching" is ______.

A．Group work gives pupils the opportunity to learn to work together with others.
B．Pupils also learn to develop their reasoning abilities.
C．Group work provides pupils with the opportunity to learn to be capable organizers.
D．Pupils also learn how to participate in teaching activities.

A．argue for teaching bright and not—so bright pupils in the same class
B．recommend pair work and group work for classroom activities
C．offer advice on the proper use of the library
D．emphasize the importance of appropriate formal classroom teaching