题目内容：

 

Your Internet experience must be uncomfortable when the net speed is too slow — it takes so long to open a web page and the reality shows you’re watching stops every few minutes. That can make you angry.

But it could be a thing of the past. On June 3, the Ministry of Industry and Information Technology announced that China’s major telecom carriers (电信公司) would start to provide 5G services.

1. What is 5G?

The “G” in “5G” refers to “Generation”. 1G let us talk to each other, 2G let us send messages, 3G gave us mobile data and the Internet, and 4G made all of these things faster. The mobile network technologies are developing quickly.

Now 5G promises much faster data download and upload speeds, and more stable (稳定的) connections. This means that you will be able to download a complete HD movie in seconds and only experience a short delay (延迟) between sending and receiving data.

2.What changes will 5G bring us?

With a 5G network, the short delay in information exchange will allow driverless cars to run more safely. Meanwhile, 5G-enabled wearable devices (设备) will be in use in hospitals. Besides,VR games will become more popular with 5G. The short delay of 5G will make the games feel even more real.

3. Does 5G have any disadvantages?

According to the BBC, though 5G will make our lives more convenient, it will not be perfect. For one thing,  1          . On 4G networks, you can be 10 kilometers away from the nearest transmission base and hardly lose signal (信号). But 5G will only cover about 300 meters. And in order to use 5G, we will have to buy new products designed for 5G that are expensive at present.

1.“G” in “5G” means the generation of________.

A.the mobile network experience B.the mobile communication technology

C.the speed of data download and upload D.the delay in data exchange

2.According to the passage, the best sentence for the blank is    1          .

A.5G will not “travel” far B.5G will be used in a limited way

C.products designed for 5G is expensive D.5G has its both advantages and disadvantages

3.What is the passage mainly about?

A.Changes in the mobile technologies. B.The uses of 5G.

C.Disadvantages of 5G. D.An introduction to 5G.