20 13 cloze translation of Lanzhou English senior high school entrance examination

People have always been curious about the earth where they live and the sky above them. When early humans looked up at the night sky, they would ask themselves many questions. They looked at the moon and wondered what this strange bright object was in the sky. They don't understand why the moon changes shape every night. They observe stars and planets. They are also curious about why some stars change positions and others don't. They also consider the shape of the earth. Most early humans believed that the earth was flat. In different parts of the world, people have different views on the universe. The ancient Greeks were the first people to study the universe more scientifically. In the 6th century BC, Pythagoras first put forward the theory that the earth is round. However, he couldn't explain why people at the bottom of the sphere wouldn't fall. It was not until the seventeenth and eighteenth centuries that scientists discovered the answers to some key questions. With the help of telescopes, people can observe the sky more clearly and find the exact positions of stars and planets. Finally, in 1665, Newton explained to the world what gravity is. At this time, people finally understood why they would not fall.

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