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
According to the writer, forecasting is fairly accurate in ______.
A．politics
B．science
C．sociology
D．economy
单项选择题
H. J. Rand's prediction about the year 2000 shows that ______.
A．it is easy to figure out in advance what will happen
B．it is difficult to figure out in advance what will happen
C．only professionals can figure out in advance what will happen
D．very few professionals can figure out in advance what will happen
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