Passage one

46.C  interactive television is successful

47.C  somewhat doubtful

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48.C  it has placed TV advertising

49.B  it has down well in engaging the viewer

50.A  they maybe due the novel way of advertising

Passage two

51. B  insufficient demand

52. D  groundless

53. A  the booming defense industry

54. A  powerful opposition to government

55. C  to show urgent need for the government to take action

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英语四级辅导：https://www.thea.cn/wx1820/