压缩过程中缸内气体被挤入活塞顶部凹坑形成的气流运动称为（） A.涡流 B.挤流 C.

完成表格 阅读下面的短文，根据内容，完成表格中所缺的信息。（共5小题，每小题1分，计5分）
George Stephenson 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. On holidays, he often took engines into pieces and studied 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 was seventeen years old. Every day after he did twelve hours of hard work, he walked a long way to have lessons from a young 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 or take trains from one place to another, we will think of this great man—George Stephenson.

Great Inventor:        小题1:
In       小题2:	He started work.
In 1795	He spent much time          小题3:         .
In 1798	He began to learn the English letters.
In 1799	He could          小题4:        for the first time.
In his life	He invented many things, including        小题5:      .