According to the passage, children suffering from autism are unable to _______.

A．After five years of intensive treatment, Adam has completely recovered.
B．Mental retardation can result in autism.
C．Parents should know some key symptoms of autism so that they can spot the disorder.
D．Diagnosing autism in children is not difficult.

A．ABC entertainment chairman had a quarrel with James Stewart, the Pulitzer Prize winner.
B．Robert Iger is one of the Disney's next chief executive candidates.
C．Michael Eisner is lack of character and incompetence.
D．Harold Vogel wrote the book "Disney War".