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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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
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.
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