A．The price fluctuates all the time because the production costs are high.
B．The production costs will be higher if the market demands more beef.
C．The price will get below production costs if your supply is larger than demand.
D．Cattle raising is a non-profit-making business in the U.S.

A．Either men or women are always introduced to the newcomer.
B．Girls over eighteen are introduced to older people.
C．A man is introduced to a woman if she is over eighteen.
D．The young are introduced to the old if they are of different sexes.