One of the most interesting new uses for glass is in telephone communication. Scientists have developed glass fiber as thin as human hair which is designed to carry light signals. When the light reaches the other end, it is first changed into electrical signals, which are in turn converted into sound messages.

A．consumers always hasten to buy goods
B．women are more sensitive to the rising in prices
C．rising prices may make people put off their purchase of goods
D．the expectations of price decreases often make buyers feel sad