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 vice-mayor Wu Qing made the first 5G video call on a Huawei Mate X Smartphone. Shanghai 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 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 information. With this kind of lag, the cars might crash because they don't receive instructions in time. With 5G, this lag will be greatly lowered, making the cars safer.
5G could also be used to power the internet of things (IoT), that is, a large online network that connects all things and people. Fast internet speeds will be the key to developing 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.
1、Which city was 5G tested for the first time?
A.Beijing. B. Shanghai. C. Shenzhen.
2、What 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.
3、The writer uses self-driving cars as an example to .
A.explain how 5G's fast speed can be helpful
B.warn about the possible dangers of self-driving cars
C.explain how self-driving cars work
4、What 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.
5、Which 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.
答案解析：
1. B. Shanghai.
解析：根据文章第二段，上海副市长吴清在华为Mate X智能手机上进行了第一个5G视频通话，上海也成为中国第一个开始测试5G网络的城市。
2. B. 5G networks will make our lives more convenient.
解析：文章中提到5G网络不仅能提供更快的移动互联网，还能用于许多其他事情，如使自动驾驶汽车更安全，推动物联网的发展，这些都表明5G网络将使我们的生活更加便利。
3. A. explain how 5G's fast speed can be helpful
解析：文章通过自动驾驶汽车的例子来说明5G网络的高速可以减少延迟，从而使汽车更安全，这是在解释5G的快速速度如何提供帮助。
4. C. A large online network that connects things and people.
解析：根据文章最后两段，物联网是一个将所有事物和人连接在一起的大型在线网络。
5. C. Our refrigerator can order eggs online for us.
解析：文章最后提到，通过物联网，当冰箱发现里面没有鸡蛋时，可以自动在线订购鸡蛋，这说明冰箱可以为我们在线订购鸡蛋。
