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
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单项选择题
Which of the following is true about Copernicus
A．He had two brothers and a sister.
B．He used to be called Niklas Koppernigk.
C．His father died soon after he was born.
D．He spent 10 years at the University of Cracow.
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
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