题目内容

关于广域网的说法中错误的是（）

A. 广域网链路通常由运营商建设，并向用户收费。
B. 广域网的接入方式包括但不限于包交换、VPN、专线、无线等。
C. 广域网的链路通常需要认证才能接入。目的是防止非法用户接入。
D. 包交换的广域网接入方式中包含帧中继，但不包括x.25

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Of all the problems technology brings to us, which is not mentioned?

A. cyber crimes
B. social isolation
C. threat of robots
D. spam

We are now living in a digital age marked by social media, big data and AI technology.

A. 对
B. 错

Technology is basically the application of scientific knowledge for practical purposes.

A. 对
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Large population has made technology possible and technology has made large population indispensible.

A. 对
B. 错