What is 5G? It is the fifth generation (代) of mobile network technology. These new networks are coming.
China issued commercial license (发放商用牌照) for 5G on June 6, 2019. This means that China’s Telecom (中国电信) companies have been able to offer 5G networks to mobile phone users.
Each mobile network generation is faster and more powerful than the one before it. 1G let us talk to each other. 2G let us send messages. 3G gave us data (数据) and the Internet. And 4G made all of these things faster. What’s special about 5G?
5G has a very short delay (延时) between sending and receiving information. Now, 4G takes about 100 to 200 milliseconds (毫秒) to send and receive data. But 5G will reduce the delay to 1 millisecond or less. This big change will not only make our mobile Internet faster, but also deeply change our lives.
Entertainment (娱乐)
5G networks are about 100 times faster than 4G. This means you can download (下载) a movie in seconds.
Transportation
5G will also bring us safer self-driving cars. These cars can send signals (信号) to each other. 5G will allow cars to react (反应) even faster than real drivers.
Smarthomes
5G also makes the Internet of Things possible. Internet of Things is a large network that connects everything to the Internet. Smarthomes are part of it. For example, if its sensor feels the air becoming dry, a smart sprinkler (洒水器) can water your plants by itself.
46. How many generations of mobile network technology have been in use in China so far?
47. What happened on 6 June, 2019 according to the passage?
A.5G was invented by Chinese. |
B.Mobile phone users could talk to each other. |
C.China issued commercial license for 5G. |
D.5G was known by people home and abroad. |
48. Which of the following is NOT true according to the passage?
A.Plants can be watered by a smart sprinkler with 5G. |
B.People has stopped using 4G in our life because of 5G. |
C.5G is faster and more powerful than 4G. |
D.We can download a movie faster with 5G. |
49. If it takes you about two hours to download several films with 4G network, how long does it take you to download them with 5G network?
A.About 2 seconds. | B.Less than 2 minutes. |
C.About 10 minutes. | D.More than 20 minutes. |
50. What’s the main idea of the passage?
A.Each mobile network generation has its own advantages. |
B.5G will bring us safer self-driving cars. |
C.Mobile phone users can use 5G networks. |
D.5G will change our lives in many ways. |