问题:
A . at the start of spring,when the Sun is nearly over the equator
B . only when the Sun and Moon are on the same side of the Earth and nearly in line
C . when the Sun and Moon are at approximately 90°to each other as seen from the Earth
D . when the Sun,Moon,and Earth are nearly in line,in any order
● 参考解析
本题暂无解析
相关内容
相关标签