It has been ______ years since Galileo made the first telescope. With the help of telescopes, scientists can ______.

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问题 It has been ______ years since Galileo made the first telescope.
With the help of telescopes, scientists can ______.

选项 A、discover all stars and planets in the universe
B、gain more knowledge about the universe
C、study the craters, mountains and plains on the moon’s surface
D、increase our knowledge of the earth

答案B

解析
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