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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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, land gravity.
C．Aristotle's natural science.
D．Galileo's discoveries.
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 cannot discover what forces "really" are
C．that there are serf - evident principles
D．that we can discover why things behave as they do
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