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．in toy-making there is a continuity in file use of materials
B．even the simplest toys can reflect the progress of technology
C．it often takes a long time to introduce new technology into toy-making
D．even a simple toy can mirror the artistic tastes of the times.