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  3. Millions of stars are traveling about in space. A few form groups which journey together, but most of them travel alone. And th

Millions of stars are traveling about in space. A few form groups which journey together, but most of them travel alone. And th

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问题     Millions of stars are traveling about in space. A few form groups which journey together, but most of them travel alone.  And they travel through a universe so large that one star seldom  comes near to another.
    We believe, however, that some two thousand million years ago, another star wandering through space, happened to come near our sun. Just as the sun and the moon raise tides on the earth, so this star must have raised tides on the surface of the sun. But they were very different  from the small tides that are raised in our oceans; a large tidal wave’ must have travelled over the surface of the sun, at last forming a mountain so high that we cannot imagine it. As the cause of the disturbance (动荡) came nearer, so the mountain rose higher and higher. And before the star began to move away again, its tidal pull had become so powerful that this mountain was torn to pieces and threw off small parts of itself into space.  These small pieces have been going round the sun ever since.  They are the planets (行星).  
The article suggests that______.
选项 A、our earth exists before the sun
B、how space formed
C、no one knows where the earth comes from
D、our earth used to be part of a high mountain on the sun
答案D
解析 从最后一段及its tidal pull had become so powerful that this mountain was torn to pieces and threw off small parts of itself into space可推断地球也是在太阳爆炸的小碎片中形成的。
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