As we know, China is developing fast in science and technology.

Surprising robot

Can you imagine a robot swimming like a fish in the sea? A group of scientists at Westlake University in China have made one. Its name is Sea guru II. In March, 2025, the robot went 2,000 metres under the South China Sea successfully.

Smart Beidou

When you open a map on your phone in China, it is probably guided by the Beidou navigation Satellite System (BDS，北斗卫星导航系统). China started to build the BDS in 1994. It’s never an easy thing. Over 400 teams and more than 300,000 scientists have come together to solve big problems in building it.

Fast train

Do you want to travel on the fastest train in the world? The CR450 made by the China Railway Group is a new high-speed train that can travel at 400 km/h on average (平均). Its highest speed is 453 km/h. Before this, the fastest high-speed train in the world was China’s CR400. What’s more, CR450 stops quickly and makes little noise. It will further meet people’s wishes for a better experience.

1.1.Sea GuruⅡ went 2,000 metres under the South China Sea in March, 2025.

A T

B F

C

D

解析：选A。T 解析：文中明确提到 “In March, 2025, the robot went 2,000 metres under the South China Sea successfully.”，与句子表述一致，故答案为 T。

2.2.It is easy for Chinese teams and scientists to build the BDS.

A T

B F

C

D

解析：选B。F 解析：原文指出 “It’s never an easy thing. Over 400 teams and more than 300,000 scientists have come together to solve big problems in building it.”，说明建造北斗系统并非易事，与句子中 “easy” 表述相反，故答案为 F。

3.3.The fastest high-speed train in the world is China’s CR400 now.

A T

B F

C

D

解析：选B。F 解析：文中提到 “The CR450 made by the China Railway Group is a new high-speed train that can travel at 400 km/h on average... Before this, the fastest high-speed train in the world was China’s CR400.”，表明现在最快的高铁是 CR450，而非 CR400，故答案为 F。

4.4.

A T

B F

C

D

解析：选A。T 解析：根据 “The CR450 made by the China Railway Group is a new high-speed train... Before this, the fastest high-speed train in the world was China’s CR400.” 可知，CR450 和 CR400 均为中国制造，与句子表述相符，故答案为 T。

5.5.The passage shows China’s development in science and technology.

A T

B F

C

D

解析：选A。T 解析：文章开头就说 “As we know, China is developing fast in science and technology.”，随后分别介绍了水下机器人、北斗系统和高速列车三项科技成果，体现了中国科技的发展，故答案为 T。