阅读理解。 George Stephenson (乔治· 史蒂芬) was born in 1781 in a poor family. He had to start work when he was only eight. When George was fourteen, he became his father's helper. He spent a lot of time learning about engines(发动机). And on holidays he often took one to pieces and studies each piece carefully. Soon he became a very good worker though he could not read or write. He began to learn the English letters when he wa s seventeen years old. Every day after he did twelve hours of hard work, he walked a long way to have lessons from a young school teacher. On his eighteenth birthday, he wrote his own name for the first time in his life. George invented many things in his life. The train was the greatest one among them. Today when we watch of take trains from one place to another, we'll think of  this great ma n-George Stephenson. 1. In which year did George Stephenson start to help his father? A. In 1781. B. In 1789. C. In 1795. D. In 1798. 2. He learned about the engine ________. A. through reading and writing B. b y taking it to pieces and studying each piece carefully C. at lesso ns from a young teacher D. by asking a lot of questions 3. He spent a lot of time learning about engines and soon he became ________. A. a great man B. a good maker C. a good worker D. a good student 4. ________ was invented by George Stephenson. A. The train B. The telephone C. The car D. The computer 5. From the passage we know George Stephenson was one of the greatest ________ in the world. A. workers B. writers C. learners D. inventors