A
All networks like 3G and 4G will be things of the past, because 5G will be reachable in the near future. So, what’s 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 what’s more impressive is 5G’s 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. It’s 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. It’ll 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 won’t have to work so hard anymore.
However, 5G is not perfect. One major disadvantage has to do with why it’s 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 can’t 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 5G’s 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 5G’s development from 4G.
2. According to the author, the self-driving cars will ________.
A. cause more car accidents
B. slow down 5G’s development
C. run without being connected to the Internet
D. have a much faster reaction speed than humans
3. 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.
A
【答案】1-4 BDBA
这是一篇说明文。主要讲述了3G和4G等所有网络都将成为过去，因为5G将在不久的将来实现。那么，5G有何特别之处呢？5G给我们工作、生活带来改变，但是5G也有它的缺点。
1.推理判断题。第一段说明所有网络，比如3G和4G都将是过去的事情，因为5G将在不远的将来实现。那么，5G有什么特别？首先，其下载速度可以高达20GB/秒，是4G的100至200倍。但更令人印象深刻的是5G的低延迟率。现在，4G发送和接收信息平均需要200毫秒，但5G却将把它降低到1毫秒。可以看出说明5G的优点是通过把5G和4G进行对比，所以论证方式是对比，故选B。
2.细节理解题。第二段中的 “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.” 说明人类反应时间是200毫秒，但我们每天仍有交通事故。5G网络下的自动驾驶汽车可以在1毫秒内对周围数百辆汽车做出反应。所以自动驾驶汽车比人类有更快的反应速度。故选D。
3.词义猜测题。第三段中的 “Operations could be performed by robots controlled by experts from the other side of the world.” 说明操作可以由来自世界另一端的专家控制的机器人执行。这句话在画线短语所在句子之前，因此画线句句意：工厂可以配备可以相互传达任务的机器人，并且可以通过5G网络高效地完成更多工作。故选B。
4.主旨大意题。最后一段的第一句 “However, 5G is not perfect. One major disadvantage has to do with why it’s so fast.” 说明5G并不完美。一个主要缺点与为什么它如此之快有关。这句是这一段的主题句，所以这一段介绍的是5G的缺点。故选A。
All networks like 3G and 4G will be things of the past, because 5G will be reachable in the near future. So, what’s 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 what’s more impressive is 5G’s 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. It’s 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. It’ll 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 won’t have to work so hard anymore.
However, 5G is not perfect. One major disadvantage has to do with why it’s 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 can’t 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 5G’s 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 5G’s development from 4G.
2. According to the author, the self-driving cars will ________.
A. cause more car accidents
B. slow down 5G’s development
C. run without being connected to the Internet
D. have a much faster reaction speed than humans
3. 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.
A
【答案】1-4 BDBA
这是一篇说明文。主要讲述了3G和4G等所有网络都将成为过去，因为5G将在不久的将来实现。那么，5G有何特别之处呢？5G给我们工作、生活带来改变，但是5G也有它的缺点。
1.推理判断题。第一段说明所有网络，比如3G和4G都将是过去的事情，因为5G将在不远的将来实现。那么，5G有什么特别？首先，其下载速度可以高达20GB/秒，是4G的100至200倍。但更令人印象深刻的是5G的低延迟率。现在，4G发送和接收信息平均需要200毫秒，但5G却将把它降低到1毫秒。可以看出说明5G的优点是通过把5G和4G进行对比，所以论证方式是对比，故选B。
2.细节理解题。第二段中的 “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.” 说明人类反应时间是200毫秒，但我们每天仍有交通事故。5G网络下的自动驾驶汽车可以在1毫秒内对周围数百辆汽车做出反应。所以自动驾驶汽车比人类有更快的反应速度。故选D。
3.词义猜测题。第三段中的 “Operations could be performed by robots controlled by experts from the other side of the world.” 说明操作可以由来自世界另一端的专家控制的机器人执行。这句话在画线短语所在句子之前，因此画线句句意：工厂可以配备可以相互传达任务的机器人，并且可以通过5G网络高效地完成更多工作。故选B。
4.主旨大意题。最后一段的第一句 “However, 5G is not perfect. One major disadvantage has to do with why it’s so fast.” 说明5G并不完美。一个主要缺点与为什么它如此之快有关。这句是这一段的主题句，所以这一段介绍的是5G的缺点。故选A。
