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
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试题解析
50.答案为B 从全文整体来看,主要讲述的是行星的形成过程,因此选B。