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 your 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 U. S. top out at an average of 19.42 Mbps. But by comparison 5G promises gigabit (千兆) speeds.

“5G is one of those signs, 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, but also connected infrastructure (基础设施) construction. There’s lots of data behind that task, which is why we need high speed.

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

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’s 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 does the author want to stress in Paragraph 1?

A.The lighting-fast speed of 5G.

B.The expectation of 5G world.

C.The difference between 4G and 5G.

D.The internet-connected devices in our life.

2.What does the underlined word “emblem” in Paragraph 2 mean?

A.Exhibition. B.Success.

C.Symbol. D.Explanation.

3.We can infer from the text that ________.

A.5G world won’t come without AR glasses

B.5G helps to create the artificial intelligence vehicle

C.Apple company is developing AR glasses worldwide

D.Tech companies will face the fact that smartphones may be replaced

4.What will the author probably tell us next?

A.How to fully expand 5G coverage.

B.Smart glasses will become faster and lighter.

C.Why 5G isn’t concentrated in big cities.

D.The importance of infrastructure construction.