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.

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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 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

单项选择题

According to the passage, it is difficult to be certain about the distant future of the universe because we（）

A．have too many conflicting theories
B．do not have enough funding to continue our research
C．are not sure how the universe is put together
D．have focused our investigations on the moon and planets