【题目】 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 the symbols will become things of the past after 5G networks fully arrive

On March 30 Shanghai vicemayor Wu Qing made the first 5G video call on a Huawei Mate X SmartphoneShanghai has also become the first city in China to start testing 5G networks

About 100 times faster than 4G networks 5G will let people download and upload data(数据) faster than over before But 5G won't just bring faster mobile internet People can use it for many other things well

For example 5G will help to make selfdriving cars safer Today's selfdriving test cars have one problem﹣﹣lag(延迟). When the car " sees " an obstacle(障碍物), it sends this information to a data center and receives instructions However it will be some time before it sends and receives this infomation With this kind of lag the cars might crash because they don't receive instructions in timeWith 5G this lag will be greatly lowered making the cars safer

5G could also be used to power the internet of thingsIoT), that is a large online network that connects all things and people Fast internet speeds will be the key to developing this technologyThe 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

1Which city was 5G tested for the first time

A. Beijing

B. Shanghai

C. Shenzhen

2What can we infer(推测) according to the passage

A. 5G is widely used in China now

B. 5G networks will make our lives more convenient

C. There are no symbols at the top of our phones

3The writer uses selfdriving cars as an example to

A. explain how 5G's fast speed can be helpful

B. warm about the possible dangers of selfdriving cars

C. explain how selfdriving cars work

4What is IoT according to the passage

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

5Which sentence is right according to the passage

A. 5G will help us buy eggs quickly

B. Robots can help us buy eggs online

C. Our refrigerator can order eggs online for us

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