Huang Xuhua，the chief designer of China's first﹣generation nuclear submarines （核潜艇），passed away in Wuhan at the age of 99 on February 6th，2025.He was widely regarded as the "father of China's nuclear submarines". Born in March 1926 to a family of doctors in Guangdong，Huang was the third child of his parents.After spending his boyhood in wartime，he went to Shanghai Jiao Tong University to study shipbuilding.Upon graduation in 1949，Huang began his lifelong career in the shipbuilding industry. In 1958，Huang was secretly called to Beijing to join the research team tasked with designing （设计） China's first nuclear﹣powered submarine.From that point on，for the next 30 years，he hardly ever went home.At that time，China lacked （缺乏） the basic conditions to develop nuclear submarines.Not only did none of the researchers have any knowledge in this field，but other countries were highly protective of such technologies，offering few technical references （技术参考）. So Huang and other researchers started by searching newspapers and magazines for information.After carefully analysing that information and studying two US submarine models，they finally came up with five plans. The team members didn't have computers or digital calculators，so they used abacuses （算盘） to solve problems.To ensure the results were correct，they were divided into three groups to do the math at the same time and would do the math again if the three values （数值） were different. After years of hard work，China finally built its first nuclear﹣powered submarine in 1970，becoming the fifth nation to have nuclear submarines. Huang's name remained secret until 1987，when a magazine in Shanghai was allowed to publish a report revealing （展示） only his family name. Even in his 90s，Huang visited his office every weekday morning to review materials of his know﹣how and experience.He also provided advice for young researchers on solving technical problems.In recognition of his great contributions，Huang was given the Medal of the Republic，China's highest honour，in 2019. （1）Which basic information about Huang Xuhua is TRUE？ 　 　 A.He was born to a poor family. B.He majored in （主修） shipbuilding. C .He graduated from Peking University. D.He was famous for AI research. （2）Why was it difficult for China to develop nuclear submarines at the beginning？ 　 　 A.There were no shipbuilding industries in China. B.The researchers had too much knowledge in other fields. C.Other countries shared their technologies freely. D .China didn't have basic conditions and technical references. （3）How did Huang and other researchers get information for designing？ 　 　 A.By asking foreign experts. B.By buying advanced technology. C.By searching newspapers and magazines. D.By working on their own without any information. （4）What can we infer （推断） from the fact that Huang's name remained secret until 1987？ 　 　 A.Huang changed his name at that time. B.Huang was not important in the project. C.Huang didn't want his name to be known. D.The project that Huang worked on was top﹣secret. （5）What did Huang Xuhua do in his 90s？ 　 　 A.He kept on working. B.He taught young students in schools. C.He lived in his hometown. D.He started a new project.