单项选择题

The best topic for the passage is "_________".

A．What Is a Telescope
B．The History of Telescopes
C．How a Telescope Works
D．How Far a Telescope Can Reach
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单项选择题
With the help of telescopes, scientists can _________.
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
单项选择题
Through telescopes men have discovered that _________.
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
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