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If you look at the top of your phone, you’ll usually see a little symbol that says 3G or 4G. The “G” stands for the “generation” of your mobile network. But these symbols will become things of the past after 5G networks fully arrive.
On March 30th, 2019, Shanghai vice-mayor (副市长) Wu Qing made the first 5G video call on a Huawei Mate X smart phone, CGTN reported. Shanghai has also become the first city in China to start testing 5G metworks.
About 100 times faster than 4G networks. 5G will let people download and upload data faster than ever before. But 5G won’t just bring faster mobile Internet. People can use it for many other things as well.
For example, 5G will help to make self-driving cars safer. Today’s self-driving test cars have one problem lag. When the car “sees” an obstacle (障碍物), it sends the information to a data center and receives instructions. However, it takes time to send and receive information. With this kind of lag, the cars might crash because they don’t receive instructions in time. With 5G, this lag will be great lowered, making the cars safer, according to CNN.
5G could also be used to power the Internet of Things (IoT 物联网). This refers to a large online network that connects all things and people. Fast Internet speeds will be the key to develop this technology.
The IoT could be used in a lot of ways. For example, with IoT, your refrigerator could automatically (自动地) place an order online for eggs when it finds that there are no eggs left inside. What happened to the swallow at last?
1．We can know from the passage that 5G ________. ( )| A．stands for the generation of your smart phone |
| B．can make the networks 100 times faster than 4G |
| C．will be fully used immediately |
| D．has been firstly tested in Beijing |
| A．explain how 5G’s fast speed can be helpful |
| B．explain how self-driving cars work |
| C．show us how advanced self-driving cars are |
| D．warn about the possible dangers of self-driving cars |
| A．a robot that can do housework |
| B．an online store where you can buy anything |
| C．a large online network that connects things and people |
| D．a type of high-tech refrigerator |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
