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
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
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