单项选择题

What principles most influenced scientific thought for two thousand years

A．The speculations of Thales.
B．The forces of electricity, magnetism, and gravity.
C．Aristotle's natural science.
D．Galileo's discoveries.
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单项选择题
The passage says that until recently scientists disagreed with the idea ______.
A．that there are mysterious forces in the universe
B．that man can not discover what forces "really" are
C．that there are self-evident principles
D．that we can discover why things behave as they do
单项选择题
The aim of controlled scientific experiments is ______.
A．to explain why things happen
B．to explain how things happen
C．to describe self-evident principles
D．to support Aristotelian science
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