单项选择题

For whom is the author probably writing this passage

A．Train engineers.
B．Professors of statistics.
C．General audiences.
D．Young children.
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单项选择题
What does the author see as the function of the universe's unseen switches
A．They tell us which one of the tracks the universe will use.
B．They give us information about the lunar surface.
C．They enable us to alter the course of the universe.
D．They determine which course the universe will take in the future.
单项选择题
The best title for this passage is ______.
A．Ducks Unlimited or Hunters Unlimited
B．Hawaiian Archipelago
C．Sportsmen and Non-sportsmen
D．The Navy and Air Force
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