Question textQuestions 18 to 20: Complete the following table by using ONE NUMBER from the lecture. How long did it take each media technology in the US to gain an audience of 50 million? [table] Media technologies | Length of time Radio | (18) Answer 1 Question 6 years Personal computer | (19) Answer 2 Question 6 years Internet | (20) Answer 3 Question 6 years [/table]多项填空题

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