题目内容：

    China will soon issue licenses for the commercialization (商业化 ) of 5G, as the country has already established (建立) a competitive advantage in the superfast wireless technology.

The Ministry of Industry and Information Technology said 5G is entering a critical period of commercial deployment (部署)globally and China's 5G industry has established a competitive advantage through a combination of innovation(创新) and open cooperation.

Many foreign companies including Nokia and Intel, have participated in China's technical 5G tests. These foreign companies have already participated in three phases of tests organized by China to get their 5G products and solutions ready for commercial use in the country.

“With joint efforts of all parties, China has built a foundation for commercialization of 5G,” the ministry said, adding it will issue commercial 5G licenses in the near future, a clear sign that China will soon officially enter the first year of 5G.

China's big three telecom carriers are forecast to spend 900 billion to 1.5 trillion yuan ($ 134 billion to $ 223 billion) in total on 5G network construction from 2020 to 2025, according to a report from the China Academy of Information and Communications Technology. In comparison, Chinese telecom operators spent 720 billion yuan on 4G network construction from 2014 to 2018.

In 2019, China Mobile plans to build 30,000 to 50,000 5G base stations, while China Telecom is looking to have 20,000.

1.What does the phrase "participate in" in Paragraph 3 mean?

A.take part in B.take control of

C.be grateful for D.do an activity regularly

2.How much did Chinese telecom spend in constructing 4G network from 2014 to 2018?

A.223 billion yuan. B.720 billion yuan.

C.900 billion yuan. D.1.5 trillion yuan.

3.which of the following plans to build about 44,000 5G base stations in 2019?

A.Nokia. B.Intel.

C.China Mobile. D.China Telecom.

4.What does the text mainly tell us?

A.A brief introduction of 5G

B.The advantage of 5G network

C.The cost of China's 5G network construction

D.The development of China’s 5G Commercialization