Che Jingang is an unusual 14-year-old middle school student. He has been crazy about aviation (航空) science since his early childhood and studies hard all the time to realize his dream.

Che fell in love with paper planes in kindergarten. He was curious about how paper planes flew in the sky. Gradually, his home turned into a small lab for his aircraft tests. As he grew up, he spent three hours a day reading professional books on aeronautics (航空学). When he was in Grade Three of primary school, he learned difficult knowledge like calculus and aerodynamics (微积分与空气动力学) on his own. Besides, he learned to use CAD and SolidWorks to draw engineering pictures and create 3D models.

Later, Che learned through online popular science videos and decided to build a real turbojet engine (涡轮喷气发动机). He never copied others’ designs, for he thought simple copying could not help him make real progress. Instead, he designed all parts by himself, calculated airflow and pressure with professional tools, and shared his research steps on short-video platforms.

Lots of online fans offered useful advice and printed machine parts for him for free. It took him half a year to finish his first engine model, but its first test ended in failure. He soon found problems with fuel and engine structure. However, he stuck to his project. He believed that few people could succeed at the first attempt, and failures could help him learn and grow. At present, Che is upgrading his engine and getting ready for new tests.

1.1.What do we know about Che Jingang from the first paragraph?

A He has loved aviation since childhood.

B He is 15 and in high school.

C He gives up dreams easily.

D He spends little time studying.

解析：选A。A 细节理解题。文章第一段明确提到“He has been crazy about aviation science since his early childhood”（他从小就痴迷于航空科学），这与选项A“他从小就热爱航空”完全吻合。选项B错误，因为原文说他是“14-year-old”，而非15岁，且是中学生而非高中生。选项C“他轻易放弃梦想”和选项D“他很少花时间学习”均与第一段中“studies hard all the time”（一直努力学习）的表述相反。故选A。

2.2. What did Che Jingang do when he was a third-grader of primary school?

A He built his first engine.

B He taught himself aviation knowledge.

C He made many paper planes.

D He got help from online fans.

解析：选B。B 细节理解题。文章第二段明确指出“When he was in Grade Three of primary school, he learned difficult knowledge like calculus and aerodynamics on his own”（小学三年级时，他自学航空相关专业硬核知识<微积分、空气动力学>），这与选项B“他自学航空知识”完全一致。选项A“建造第一台发动机”发生在后来；选项C“制作许多纸飞机”是更早的幼儿园时期的事情；选项D“得到网友帮助”是后来设计发动机时的事，均与题干时间不符。故选B。

3.3.Why did Che choose to design all parts by himself?

A Nobody offered him any help.

B He thought copying made little progress.

C He had no online fans at that time.

D His designs were the most popular.

解析：选B。B 细节理解题。文章第三段直接说明了原因：“He never copied others’ designs, for he thought simple copying could not help him make real progress”（他从不抄袭别人的设计，因为他认为简单的抄袭不能帮助他取得真正的进步），这与选项B“他认为抄袭进步不大”相符。选项A“没人帮助他”与后文网友提供帮助矛盾；选项C“那时他没有网友”也与事实不符；选项D“他的设计最受欢迎”文中未提及。故选B。

4.4.The underlined phrase “stuck to” is closest in meaning to ______.

A gave up

B was worried about

C was proud of

D kept on with

解析：选D。D 词义猜测题。划线短语“stuck to”出现在“he stuck to his project”一句中。前文提到他的第一次测试以失败告终，但后文说“He believed that few people could succeed at the first attempt, and failures could help him learn and grow”（他相信很少有人能一次成功，失败能帮助他学习和成长），这表明他没有放弃，而是坚持了下来。因此，“stuck to”的意思应该是“坚持”，与“kept on with”意思最接近。选项A“gave up”（放弃）与文意相反；选项B“was worried about”（担心）和选项C“was proud of”（自豪）均不符合语境。故选D。

5.5. What does the writer want to tell us through Che’s story?

A Success comes from family support.

B Failure is never seen in science.

C Schoolwork matters more than hobbies.

D Keeping trying brings you closer to your dream.

解析：选D。D 主旨大意题。文章讲述了车金刚从小热爱航空，通过自学、动手设计发动机，即使面对失败也不放弃，持续追逐梦想的故事。结尾处“this hard-working and creative boy keeps moving forward for his aviation dream”（这个勤奋且有创造力的男孩正朝着他的航空梦不断前进）点明了主题。选项D“坚持不懈能让你更接近梦想”与此核心思想一致。选项A“成功来自家庭支持”文中未强调；选项B“科学中从未见过失败”与文中失败经历矛盾；选项C“学业比爱好更重要”也与文章传达的追求梦想的精神相悖。故选D。