单选题 5G stands for fifth generation, meaning the next step in the progression of technology to replace the current 4G system．4G was the replacement for 3G, which came a and so on．

Earlier "G" systems were designed to improve mobile communication operations．Each new technology brought major improvements in speed and greatly increased ne capacity．

The new 5G system promises more of the same．It is expected to permit more users to do more things -- at a faster rate．

Wireless industry groups say 5G will help fu "smart cities" by connecting sensor networks．

Such networks will be able to control vehicle traffic and quickly identify streetlight outages．

5G is also expected to conn driving cars and support new technologies involving virtual reality．

Higher 5G speeds could also permit doctors to commonly perform remote medical operations．

Fac and businesses could use 5G technology to increase automation and improve the collection of information．

What are the applications of 5G? ________．
【正确答案】 D
【答案解析】5G代表第五代，这意味着下一代先进的技术将取代目前的4G系统。4G是3G的替代品，3G是继2G之后的，以此类推。早期的“G”系统是为了改善移动通信业务而设计的，每一项新技术都大大提高了速度和网络容量。新的5G系统也承诺会有类似的改进。预计5G将允许更多的用户以更快的速度做更多的事情。无线行业组织称，5G将通过连接传感器网络助力未来的“智能城市”。这样的网络将能够控制车辆流量并快速识别路灯故障。5G也有望连接自动驾驶汽车，支持涉及虚拟现实的新技术。更高的5G速度还可以让医生执行远程医疗操作。工厂和企业可以使用5G技术来提高自动化程度和改进信息收集。