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
It has been _________ years since Galileo made the first telescope.
A．more than 390
B．over 350
C．about 1609
D．more than 30
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