笔者在浏览文都四六级、新浪教育等站点是发现，2018下半年全国大学英语四六级考试于12月15日进行，并且英语四级考试听力部分已经发布了：

英语听力考试New1

News 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。 youdaokaoshen 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。 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

Question 1：What are scientists planning to do？

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

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