2. 外语
  3. It has been ______ years since Galileo made the first telescope. Through telescopes men have discovered that______.

It has been ______ years since Galileo made the first telescope. Through telescopes men have discovered that______.

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问题 It has been ______ years since Galileo made the first telescope.
Through telescopes men have discovered that______.
选项 A、many more new groups of millions of stars remain unknown to us
B、stars are not in a single group
C、bigger and more powerful telescopes have been built recently
D、some stars are not single but in millions of groups
答案D
解析
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