题目内容：
In this article, the writer mainly wants to tell the readers______.
A. that the universe is so large that we cannot imagine it
B. where the planets in the universe came from
C. how the high mountains were formed on the sun
D. why the tides over the surface of the sun were so powerful
参考答案：【答案仅供学习，请勿对照自行用药等】