2020-2021学年高一上学期训练卷必修二 Unit3 The Internet英 语 （二）（本卷满分100分）一、阅读理解（每小题2分，共16分）AAll networks like 3G and 4G will be things of the past, because 5G will be reachable in the near future. So, whats so special about a 5G future? First of all, its download speed can be as fast as 20GB/s, which is 100 to 200 times that of 4G. But whats more impressive is 5Gs low delay rate. Now, 4G takes an average of 200 milliseconds(毫秒) to send and receive information. But 5G will get it down to 1 millisecond.5G is a great breakthrough. Its going to change the way equipment connects to the Internet, and more importantly, to each other. And self-driving cars may be one of the biggest breakthroughs to come out of 5G. Human reaction time is 200 milliseconds, yet we still have accidents every day. The self-driving car under a 5G network could react and communicate its reaction to hundreds of cars around it, all within 1 millisecond. Itll play a great role in preventing car accidents and ending traffic jams completely.5G can benefit us in many other ways. Operations could be performed by robots controlled by experts from the other side of the world. Therefore, more lives will be saved in time. Factories can be staffed by robots that can communicate their tasks to each other, and they can do more work efficiently over a 5G network. Imagine a group of drones(无人机) flying over a field of crops, using sensors(传感器) on the ground to sort, pick, feed, and water plants all on their own. Then farmers wont have to work so hard anymore.However, 5G is not perfect. One major disadvantage has to do with why its so fast. 5G uses the millimeter waves, while 4G uses the 15 to 40 centimeter-long waves. And shorter waves go fast but not very far. On 4G networks, the signal can go 10 kilometers. But the 5G signal can go at most 300 meters, and it cant even go through walls or rain. So, what does that mean? Having such a short signal distance means we need to build a lot of transmitters(信号发射塔) in the future.1. How does the author show us 5Gs advantages in Paragraph 1?A. By giving examples of the uses of 5G.B. By making comparisons between 4G and 5G.C. By explaining the scientific principles of 5G.D. By analyzing 5Gs development from 4G.2. According to the author, the self-driving cars will _.A. cause more car accidentsB. slow down 5Gs developmentC. run without being connected to the InternetD. have a much faster reaction speed than humans3. What does the underlined part “be staffed by robots” in Paragraph 3 mean?A. Be built by robots.B. Have robots as workers.C. Offer employees home robots.D. Produce more medical robots.4. What does the last paragraph mainly talk about?A. The main weakness of 5G networks.B. How to make 4G networks more perfect.C. The types of long waves and short waves.D. How to improve the signal of mobile phones.BThe Consumer Technology Association, formerly called The International Consumer Electronics Show, or CES, believes about 170,000 people will attend the show. About one-third of them are reported to come from countries besides the United States.More than 4,000 businesses will show products used through the Internet such as gaming, self-driving cars, artificial intelligence(人工智能) and robotics. One of the biggest stars at CES this year is the voice-controlled digital(数字的) assistant. While the technology is not new, many companies will show off the latest digital assistants.Equipment controlled by digital assistants, especially those turned on by voice, were already big sellers in 2017. This year, Google, Amazon and Apple are expected to release even more products to keep up with the rising demand.Digital assistants are powered by artificial intelligence and machine learning technology. They are designed to learn users preferences over time and then “think” and act on their own. Some of the biggest developments in technology have come in the area of home automation(自动化). Amazon Echo, Google Home, Apples Home Pod and Microsofts Cortana are a few examples of voice-controlled equipment. All include smart speakers that “talk” to users inside the house and can perform operations.Experts with the Consumer Technology Association say sales of smart speakers are expected to nearly double in 2019.The Internet-linked products can play music or find information when asked questions. They can also control equipment such as lighting, cameras, televisions and temperature controllers. Among new “smart” home products to be released at the CES are voice-controlled washing machines, refrigerators, showers and toilets. There is also much new physical fitness and health-related equipment on show. Some are designed to help people create the best personal fitness plans to reach their goals. Wearable health equipment is used to study and measure body conditions, while others help recognize signs of disease.5. What will be shown at CES?A. Books about robot