21. 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
22. What principles most influenced scientific thought for two thousand years?
[A] the speculations of Thales
[B] the forces of electricity, magnetism, and gravity
[C] Aristotles natural science
[D] Galileos discoveries
23. Bertrand Russells notion about electricity is ________.
[A] disapproved of by most modern scientists
[B] in agreement with Aristotles theory of self-evident principles
[C] in agreement with scientific investigation directed toward how things happen
[D] in agreement with scientific investigation directed toward why things happen
24. 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 self-evident principles
[D] that we can discover why things behave as they do
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