区域活动的内容来自于两个方面：一是（）；二是（）。

A. 正确
B. 错误

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