第28题: [单项选择]The need for television viewing guides is supported by study that shows that viewers tend not to select programs by ________ switching the dial. A. independently B. randomly C. attentively D. timely 参考答案:B 答案解析:[解析] A.independently独立地,自主地;B.randomly随意地,随机地;C.attentively注意地,留心地; D.timely及时地,适时地。根据句意和逻辑应选B。句意为:需