单项选择题

In ParA．3, the word "track" could best be replaced by which of the following（）

A. band
B. rails
C. path
D. sequence

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单项选择题

For whom is the author probably writing this passage（）

A．Train engineers.
B．General audience.
C．Professors of statistics.
D．Young children.

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 enable us to alter the course of universe.
C．They give us information about the lunar surface.
D．They determine which course the universe will take in the futur