27. In the American child-centered culture, which of the following is not done by parents?
   A、Parents often turn to the writings of experts---pediatricians, psychiatrists and psychologists.
   B、Parents buy a large assortment of educational toys and athletic equipment for children.
   C、Parents are reluctant and afraid to say " no" to their children' s excessive demands.
   D、Parents bring children to places of historical interest, national parks and resort areas.