Most radio and television stations in the United States are commercial stations, 【26】 is to say, they earn their money from 【27】 or commercials. Private companies purchase radio and television 【28】 from the commercial stations in order to 【29】 their products. Cable television stations are also 【30】 stations, though they do not usually have advertisements. 【31】 watch cable stations, people must pay the cable TV company a certain amount of money each 【32】
Public radio and television stations, on the 【33】 hand, do not have advertisements and people do not have to 【34】 to watch them. These stations gain their money from the 【35】 , from private companies, and from some of the 【36】 who watch or listen to their programs. The 【37】 government and some large corporations give 【38】 ,large gifts on money, to the public stations. Small businesses and people also 【39】 money to their local public radio and television stations.
ABC ,CBS, and NBC are the three 【40】 commercial radio and television 【41】 in the United States. Most local commercial radio and TV stations 【42】 their programs from one of these national networks. 【43】 example, each network had a TV news program in the evening, 【44】 the local stations broadcast in addition to their 【45】 local news programs.