Question

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（代）”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（副市長）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（延遲）. When the car“ sees ”an obstacle（障礙物）, 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 物聯(lián)網(wǎng)）. 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 place an order online for eggs when it finds that there are no eggs left inside.

根據(jù)短文內(nèi)容,選擇最佳答案.

1.In which city was 5G networks tested for the first time?

A.Beijing. B.Shanghai. C.Shenzhen. D.Guangzhou.

2.The writer uses self-driving cars as an example to______________ .

A.explain how self-driving cars work

B.show us how advanced self-driving cars are

C.warn about the possible dangers of self-driving cars

D.explain how 5Gs fast speed can be helpful

3.According to the story, the loT is __________________.

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

4.We can infer（推論）from the passage that _______________.

A.5G will be all over China. B.there are no symbols at the top of our phones

C.we can now buy self-driving cars D.5G networks are much faster than 3G and 4G

5.The refrigerator is mentioned to .

A.describe the importance of IoT B.introduce how to use the IoT

C.ercourage people to try the new product D.show 5G will be more powerful

Answer 1