In 1948, people living in remote areas could see TV programs by ______ in the United States. In a digital cable system, if ther

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问题 In 1948, people living in remote areas could see TV programs by ______ in the United States.
In a digital cable system, if there is no key to decode the signal, then, we will only see ______.

选项

答案an advertisement or the screen

解析 本题涉及到数字电缆系统。末段提到,数字电缆系统是加密的(encrypted),电视信号必须用正确的密码解密,如果没有密码,数模转换器就不能把信号转换成图像,这样的话,电缆系统就发送的是广告或蓝屏(advertisement or the familiar blue screen)。
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