Millions of stars are travelling about in space. A few form
| Millions of stars are travelling about in space. A few form groups which travel together, but most of them travel alone. And they travel through a universe which is so large that one star seldom comes near to another. For the most important part each star makes its journey in complete loneliness, like a ship on an empty ocean. The ship will be well over a million miles from its nearest neighbour. From this it is easy to understand why a star seldom finds another anywhere near it. We believe, however, that some two thousand million years ago, another star wandering(漫游) through space, happened to come near our sun just as the sun and the moon raised its tides(潮汐) 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(潮汐的) 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 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 thrown off small parts of itself into space. These small pieces have been going round the sun ever since. They are the planets. 小题1:Most stars are _________________________.
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小题1:B
小题1:B
小题1:D
小题1:C
小题1:A
小题1:根据A few form groups which travel together, but most of them travel alone. 描述，可知大部分没有固定的轨道。故选B。
小题1:根据We believe, however, that some two thousand million years ago, another star wandering(漫游) through space, happened to come near our sun just as the sun …… at last forming a mountain so high that we cannot imagine it. As the cause of the disturbance came nearer, so the mountain rose higher and higher.描述，可知选B。
小题1:根据And before the star began to move away again, its tidal pull had become so powerful that this mountain was torn to pieces and thrown off small parts of itself into space.描述，可让我们想到地球曾经也是太阳上的一座高山。故选D。
小题1:联系上文描述，可知这指的是这颗星星来到太阳附近，故选C。
小题1:通过阅读短文，可知这篇短文主要说明了宇宙中一些行星的来历，故选A。
小题1:B
小题1:D
小题1:C
小题1:A
小题1:根据A few form groups which travel together, but most of them travel alone. 描述，可知大部分没有固定的轨道。故选B。
小题1:根据We believe, however, that some two thousand million years ago, another star wandering(漫游) through space, happened to come near our sun just as the sun …… at last forming a mountain so high that we cannot imagine it. As the cause of the disturbance came nearer, so the mountain rose higher and higher.描述，可知选B。
小题1:根据And before the star began to move away again, its tidal pull had become so powerful that this mountain was torn to pieces and thrown off small parts of itself into space.描述，可让我们想到地球曾经也是太阳上的一座高山。故选D。
小题1:联系上文描述，可知这指的是这颗星星来到太阳附近，故选C。
小题1:通过阅读短文，可知这篇短文主要说明了宇宙中一些行星的来历，故选A。
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