1 . There has been a lot of publicity (宣传) recently surrounding 5G, the next generation of wireless technology for the world. But what is this technology and how might it change our lives?
What is 5G?
5G stands for fifth generation, meaning the next step in the progression of technology to replace the current 4G system. 4G was the replacement for 3G, which came after 2G, and so on. These systems are wireless computer networks. Earlier “G” systems were designed to improve mobile communication operations. Each new technology brought major improvements in speed and greatly increased network capacity. The new 5G system promises more of the same. It is expected to permit more users to do more things-at a faster rate. Higher internet speeds and larger network capacity should result in better performance for device users connected to 5G. However, technology experts say there is a major way that 5G is different than the earlier systems. It will move well beyond mobile network technology to affect many more devices and industries than other “G” versions.
When will it be available?
Before we can all use 5G, wireless companies and phone makers will have to complete and deploy (部署) a whole new system. New phones and communication equipment must be built. American wireless companies have been preparing for the new system for some time. They have been creating new network equipment and buying broadcasting space to carry 5G signals. They have built news G antennas(天线)to serve American cities and towns. Wireless providers will invest at least $275 billion n 5G-related networks in the United States, the industry group CTIA reported. The first U.S, launch of 5G is expected to happen sometime this year. Industry experts expect it will take a few more year to go nationwide. It will take even longer to reach rural areas. China is expected to launch 5G sometime in 2020, while European nations are likely to build their systems more slowly over time.
1. Which system is widely used nowadays?| A．5G. | B．2G. | C．3G | D．4G. |
| A．It will allow more users to do more things. | B．The internet speed will be much higher. |
| C．The users will spend much less money on it. | D．It will affect more devices and industries |
| A．5G system has nothing to do with phone makers. |
| B．There is much work to do before 5G comes into use. |
| C．New phones will be much smarter than those used now. |
| D．4G system will be stopped as soon as 5G comes into use. |
| A．USA→China→European nations. | B．China→USA→European nations. |
| C．USA→European nations→China. | D．European nations→China→USA. |
2 . Researchers at the University of Scotland have discovered a protein that can influence viruses developing and even can control cancer. Now the fight is on to fully understand how it works in the hope of turning the laboratory research into a treatment.
The protein is called Hira. Technically it is a histone（组蛋白）complex, but it is easier to understand in terms of what it can do. Three years ago Dr Taranjit Singh Rai and colleagues at the Beatson Cancer Institute and Glasgow University reported that Hira could possibly suppress the division of cells that causes cancer. In the course of that research, Dr Rai found out something unusual. In the lab they have established that the Hira protein has a role to play in the anti-viral fight, thus, making it have a fundamental role to play in fighting against cancer.
The trick in using it to fight diseases may lie in increasing Hira levels in our cells. “I think what researchers might be interested in is how we can increase levels of this protein to deal with the viruses better, Dr Rai said.
Dr Rai has led an international study and support has come from Cancer Research UK and the results are published in the journal Nucleic Acids Research. But there is a major concern that the research is still limited to the laboratory.
It is going to take some time, probably years, before this work can move out of the lab and into clinics and hospitals. But the researchers are excited Hira will one day be the basis of a new approach in medicine.
1. What does the underlined word “suppress" in Paragraph 2 probably mean?| A．Motivate. | B．Monitor. | C．Control. | D．Improve. |
| A．Hira has been used in the medical treatment. |
| B．More studies should be done on Hira. |
| C．The levels of Hira in cells are unchangeable. |
| D．Hira can bring about side effects. |
| A．Cautious. | B．Optimistic. |
| C．Disapproving. | D．Doubtful. |
| A．A new way to use the protein. |
| B．A new approach to improving the division of cells. |
| C．A new medicine that can fight diseases. |
| D．A protein that can stop viruses developing. |
