Question 2 is based on the news report you have just heard.

(1) A device that weighs less than one kilogram is part of a mission that will allow scientists to deliver fourth generation or 4G mobile coverage to the moon in 2019. If successful, the tiny device will provide the moon with its first ever mobile phone network. The lunar network will support high-definition streaming of video and data between the moon and earth. The network is part of a mission to the moon. This is a project with the goal of landing the first privately paid for mission to the moon. The 4G mission is set to launch from Cape Canaveral in the United States on a space X Falcon 9 rocket in 2019. Mission to the moon intends to establish and test the first elements of a communications network on the moon. The scientists working on the project opted to build a 4G rather than a fifth generation or 5G network. (2) This is because fifth generation networks are still in testing and trial phases. This means that a 5G network may not yet be stable enough to work on the moon’s surface.

2. Why did scientists choose to set up a 4G network in their mission?

解析：A。根据录音末尾部分可知，科学家选择建立4G网络而非5G网络，是由于第五代网络仍处于测试和试验阶段，这意味着5G网络可能还不够稳定，无法在月球表面工作。由此可推断出，选择建立4G网络是因为它稳定，故正确答案为A。