The expression "hog-wild" means ______.

A．The craftsmanship in toy-making has remained essentially unchanged.
B．Toys have remained basically the same all through the centuries.
C．The toy industry has witnessed great leaps in technology in recent years.
D．Toys are playing an increasingly important role in shaping a child's character.

A．technological advances have greatly improved the durability of toys
B．the improvement of craftsmanship in making toys depends on the efforts of universities
C．the exploration of the universe has led to the creation of new kinds of toys
D．the basic characteristics of toys are the same over the world