(单选题)
Why does much work still need to be done according to the last paragraph?
A.To make radio play nicely.
B.To construct big 5G cities.
C.To do 5G trials effectively.
D.To expand 5G coverage fully.
参考答案：D
参考解析：
细节理解题。根据最后一段第二句“There’s still a lot of work to be done in the meantime, including some necessary testing to make sure the radio plays nicely with basic systems and service construction so that 5G isn’t concentrated only in big cities.”可知，与此同时，还有很多工作要做，包括一些必要的测试，以确保无线电与基本系统和服务建设配合良好，这样5G就不会只集中在大城市，即全面扩大5G覆盖。故选D。
知识点：
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