题目内容：

    Slowly but surely, we're moving closer and closer to 5G world. From smart-home security to self-driving cars, all the internet-connected devices in our life will be able to talk to each other at lightning-fast speeds with reduced delay. Objectively speaking, the fastest 4G download speeds in the US top out at an average of 19. 42 Mbps. But by comparison 5G promises gigabit （千兆）speeds.

“5G is one of those heralds （使者），along with artificial intelligence , of this coming data age.” said Steve Koenig, senior director of market research for the Consumer Technology Association. “The self-driving vehicle is a great emblem of this data age，and that is to say，it is a sign of time, because with one single task, driving, you have massive amounts of data coming from the vehicle itself, and a variety of sensors are collecting a lot of information to model its environment as it moves. It's pulling in data from other vehicles about road conditions down the lane. It could be weather information, and also connected infrastructure （基础设施）construction. There is lots of data behind that task, which is why we need the high speed.   

And virtual reality glasses and headsets haven't yet broken the mainstream, but tech companies are joyfully betting that these devices will eventually replace our smart phones. With 5G, that could actually happen. This is notable because companies such as Apple are reportedly developing AR glasses to assist— or even replace — smart phones.

Ericsson stated at February's Mobile World Congress how smart glasses could become faster and lighter with a 5G connection, because instead of being weighed down with components, the glasses could rely on hardware for processing power.

But don't get too excited. There is still a lot of work to be done in the meantime, including various trials to make sure the radios play nicely with hardware and infrastructure construction so 5G isn't concentrated only in big cities.

1.What is the first paragraph mainly about?

A.A right security of 5G. B.The super speed of 5G.

C.A potential dream of 5G. D.The present world of 5G.

2.What do some tech companies expect of virtual reality glasses?

A.They will be heavier than present ones.

B.They will process power on their own.

C.They will serve people instead of smart phones.

D.They will bring a big fortune to tech companies.

3.What will the author tell us in the next paragraph?

A.How to fully expand 5G coverage.

B.How to effectively reduce 5G trials.

C.How to nicely operate 5G hardware.

D.How to widely construct 5G big cities.