There are a lot of tourists in summer, so they take

A．the idea of "normal" achievement was challenged.
B．children needed seven years to develop normality.
C．unnatural development of normal children was achieved.
D．normal children developed at an unusual standard rate.

A．most normal two-year-old children can read.
B．brain-damaged children can overcome their disability.
C．brain-damaged children generally have high IQs.
D．children with only half a brain are more intelligent.