Questions 13 to 15 are based on the conversation you have just heard.

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．About human beings.
B．About mosquitoes.
C．About the earth.
D．About insects,