A．commodities that people buy constantly
B．commodities that people do not really want
C．commodities that people want but don't need
D．commodities that are inconvenient to purchase
A．that satisfy similar needs of the consumer
B．that consumers don't care where to buy them
C．that consumers spend much time to look for
D．that can be found in nearly every shop
A．items a consumer doesn't need
B．new items
C．life insurance
D．all the above
A．refrigerator
B．car
C．dishes
D．television set