题目

根据要求完成短文后的问题。Men have always wondered about the earth they live on and about the sky above them.When early man looked at the night sky, they asked themselves a lot of questions. They looked at the moon, and wondered what this strange bright object in the sky was. They did not understand why it changed its shape from night to night. They looked at the stars and planets. They also wondered why some of them changed their positions, while others did not.They also thought about the shape of the earth. Most early people believed the earth was flat.In different parts of the 在○里填上“＋”或“－”． 9○3＝6 6○9＝15 10○3＝13 5○3＝8 14○4＝10