Most radio and television stations in the United States are commercial stations,________26is to say, they earn their money from _______ 27or commercials. Private companies purchase radio and television_______28from the commercial stations in order to_______29their products. Cable television stations are also _______ 30stations, though they do not usually have advertisements. _______31watch cable stations, people must pay the cable TV company a certain amount of money each _______ 32 ublic radio and television stations, on the_______ 33hand, do not have advertisements and people do not have to _______ 34to watch them. These stations gain their money_______ 35the government, private companies, and from some of the36who watch or listen to their programs. The _______ 37government and some large corporations give _______ 38, large gifts on money, to the public stations. Small businesses and people also_______39money to their local public radio and television stations.
　　ABC,CBS,and NBC are the three_______40commercial radio and television _______ 41in the United States. Most local commercial radio and TV stations _______ _______42their programs from one of these national networks. _______ 43example, each network has a TV news program in the evening, _______ 44the local stations broadcast in addition to their_______45local news programs.
　　26. A．that
　　a．this
　　C．it
　　D．which
　　27. A．products
　　B．programs
　　C．produce
　　D．governments
　　28. A．place
　　B．time
　　C．period
　　D．hour
　　29. A．sell
　　B．purchase
　　C．buy
　　D．a(chǎn)dvertise
　　30. A．national
　　B．public
　　C．commercial
　　D．local
　　31. A．In order to
　　B．So to
　　C．As to
　　D．So as to
　　32. A．program
　　B．month
　　C．a(chǎn)dvertisement
　　D．piece
　　33. A．one
　　B．a(chǎn)nother
　　C．other
　　D．others
　　34. A．provide
　　S．offer
　　C．buy
　　D．pay
　　35. A．from
　　B．on
　　C．in
　　D．with
　　36. A．factories
　　B．businesses
　　C．companies
　　D．a(chǎn)udiences
　　37. A．Central
　　B．Federal
　　C．Official
　　D．Public
　　38. A．pay
　　B．income
　　C．grants
　　D．loans
　　39. A．donate
　　B．take
　　C．bring
　　D．carry
　　40. A．mature
　　B．major
　　C．minor
　　D．mere
　　41. A．programs
　　B．projects
　　C．nets
　　D．networks
　　42. A．take
　　B．get
　　C．borrow
　　D．sell
　　43. A．As
　　B．To
　　C．In
　　D．For
　　44. A．which
　　a．that
　　C．who
　　D．what
　　45. A．personal
　　B．private
　　C．own
　　D．public
　　美國大部分的廣播臺(tái)和電視臺(tái)都是商業(yè)性質(zhì)的，也就是說，他們通過播放節(jié)目或廣告賺錢。私人公司從這些商業(yè)臺(tái)購買廣播或電視的時(shí)段給他們的產(chǎn)品做廣告。有線電視臺(tái)也屬于商業(yè)臺(tái)，雖然他們并不經(jīng)常播放廣告。為了收看有線電視，人們必須每個(gè)月都向有線電視公司交納一些錢。
　　不同的是，公共廣播臺(tái)和電視臺(tái)不播廣告，人們無須付費(fèi)就能觀看。這些廣播電視臺(tái)的資金來源是政府，或是私人企業(yè)，又或者是他們節(jié)目的一部分聽眾或觀眾。聯(lián)邦政府和一些大機(jī)構(gòu)會(huì)向公共廣播電視臺(tái)提供補(bǔ)貼和大量財(cái)物。小型的商業(yè)機(jī)構(gòu)或個(gè)人也向當(dāng)?shù)氐墓�共廣播和電視臺(tái)捐款。
　　美國廣播公司、哥倫比亞廣播公司和全國廣播公司是美國的3大主要的商業(yè)廣播和電視網(wǎng)。大多數(shù)地區(qū)性的商業(yè)廣播電視臺(tái)都是從這3大全國性的電視網(wǎng)絡(luò)接收節(jié)目。例如，每個(gè)電視網(wǎng)都有一檔晚間新聞節(jié)目，地方臺(tái)在播放本地新聞之外也會(huì)加播這檔節(jié)目。