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

The writer of the passage wants us to know ______.

A．Copernicus didn't publish his book until his death
B．Copernicus dared to do nothing against the church
C．urged by his friends, Copernicus wrote his great book
D．before he went back to Poland, Copernicus started to work for the church

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