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

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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