China has successfully tested its first liquid hydrogen-powered electric unmanned aircraft (飞机), known as an eVTOL, in Baoji city, Shaanxi Province. This marks a big step forward in using liquid hydrogen for commercial purposes and encouraging the low-altitude economy.

The eVTOL was created by a team of companies, including Shaanxi Tongchen Heguang Cryogenic Technology Co Ltd, Dreamfly Technology Co Ltd, and Qing Power Technology Co Ltd. It can fly for 4 to 5 hours on a single fill of liquid hydrogen, traveling 800 to 1,000 kilometers at an average speed of 240 kilometers per hour.

Li Yongxin, chief engineer of Shaanxi Tongchen Heguang Cryogenic Technology Co, explained that liquid hydrogen is much better than traditional fuels and lithium (锂) batteries. It’s a clean energy that doesn’t pollute and works well even in very cold temperatures, unlike lithium batteries which lose a lot of energy in the cold. Liquid hydrogen also allows for much longer flights.

This successful test shows that liquid hydrogen can be used effectively in real-world situations, which could lead to its wider use. Li also mentioned that liquid hydrogen-powered eVTOLs could be used in many areas like firefighting, transport, and farming tasks such as watering, planting, and picking fruit.

China’s low-altitude economy is growing fast. The Civil Aviation Administration of China predicts that the market will grow from 500 billion yuan in 2023 to 1.5 trillion yuan by 2025, and could reach 3.5 trillion yuan by 2035, according to Xinhua News Agency.

1.1.What is the significance of testing the liquid hydrogen-powered eVTOL in Baoji city?

A It focuses on developing traditional fuel-powered aircraft.

B It contributes to the growth of the low-altitude economy.

C It shows how lithium batteries can be used in aircraft.

D It aims to replace all existing passenger aircraft.

解析：选B。B 细节理解题。根据第一段中的“This marks a big step forward in using liquid hydrogen for commercial purposes and encouraging the low-altitude economy.”宝鸡试飞成功国内首架吨级液氢电动垂直起降无人机，标志液氢技术在无人机领域重大突破，为液氢商业化应用和低空经济开辟新道路。故选B。

2.2.What can be inferred about the role of Shaanxi Tongchen Heguang Cryogenic Technology Co Ltd in the development of the eVTOL?

A It focused on marketing the eVTOL to international markets.

B It provided funding but had no technical involvement.

C It likely contributed knowledge in liquid hydrogen technology.

D It was solely responsible for the design of the aircraft.

解析：选C。C 推理判断题。根据第二段内容可知，国内首架吨级液氢电动垂直起降无人机是由同尘低温、追梦空天科技和北京嘉清联手开发的，即他们都有参与开发。由此可推知，同尘低温可能提供了相关的专业知识。故选C。

3.3.According to Li Yongxin, what is one advantage of liquid hydrogen over lithium batteries?

A It can be used in all vehicles.

B It is lighter in weight.

C It performs better in the cold.

D It is cheaper to produce.

解析：选C。C 细节理解题。根据第三段中的“It’s a clean energy that doesn’t pollute and works well even in very cold temperatures, unlike lithium batteries which lose a lot of energy in the cold.”可知，氢是一种没有污染的清洁能源，即使在非常寒冷的温度下也能很好地工作，不像锂电池在寒冷中会损失很多能量。故选C。

4.4.Which of the following is NOT mentioned as a potential use for liquid hydrogen-powered eVTOLs?

A Space exploration.

B Farming tasks.

C Firefighting.

D Transport.

解析：选A。A 细节理解题。根据倒数第二段中的“Li also mentioned that liquid hydrogen-powered eVTOLs could be used in many areas like firefighting, transport, and farming tasks such as watering, planting, and picking fruit.”氢动力电动垂直起降飞行器可用于许多领域，如消防、运输和农业任务，如浇水、种植和采摘水果。并未提及太空探索。故选A。

5.5.What is the article mainly about?

A The benefits of traditional fuels and liquid hydrogen.

B Technical details of liquid hydrogen-powered eVTOLs.

C The challenges of using lithium batteries in cold climates.

D The future of liquid hydrogen in China’s low-altitude economy.

解析：选D。D 主旨大意题。根据全文内容可知，文章主要介绍了国内首架吨级液氢电动垂直起降无人机在宝鸡试飞成功，并探讨了液态氢在商业用途和低空经济中的潜力。故选D。