单项选择题

From the passage we can see that astronomy is ______.

A．the life experience of great men
B．the movement of the stars and the planets
C．the scientific study of natural objects in space
D．the theories developed by scientists of old times

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单项选择题

Copernicus had his book published because ______.

A．he didn't agree with Aristotle
B．he couldn't hide the scientific troth
C．he worked for the church
D．his friends advised him to do so

单项选择题

Copernicus developed his theory ______.

A．by using various telescopes
B．based on Aristotle's beliefs
C．through observations and reasoning
D．under the encouragement of his friends