Einstein was born in 1879 in Germany. As a child, he was slow 1. (learn) to talk. As a pupil, he was backward. But when he was fourteen years old, he became clever. He taught 2. (he) maths from textbooks. He studied hard because he wanted to be a physicist.

In 1901, Einstein began teaching. In 1902 he continued his studies at the University of Zurich. Several years 3. (late), he formulated(系統(tǒng)地闡述)his famous Theory of Relativity(相對論).To most people, the law of relativity is difficult to explain. But once Einstein explained it very 4. (good)to a group of young students. He said，“When you sit with a good girl for two hours, you think it is only a minute. But when you sit on a hot stove for a minute, you think it's two hours. That is relativity.”

After Hitler came into power in Germany, Einstein went to America. In 1940 Einstein became an 5. (America) citizen. In 1955, Einstein's life ended at the age of seventy-six.

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