[题目1] 现代天文学告诉我们,太阳是银河系中的一颗普通的恒星,同时它又是太阳系的中心。地球沿着椭圆轨道围绕太阳运行,太阳在椭圆的一个焦点上,请回答下列问题。 (1)下图(图1)表示地球公转轨道及太阳的位置。2001年 [Topic 1] Modern astronomy tells us that the sun is an ordinary star in the Milky Way, and it is also the center of the solar system. The Earth orbits the sun along an elliptical orbit. The sun is at a focus on the ellipse. Please answer the following questions. (1) The following figure (Figure 1) shows the orbit of the earth and the position of the sun. 2001