单项选择题

What does the word "ambiguity" in Sentence 4, Para.2 mean

A．Certainty.
B．Vagueness.
C．Clarity.
D．Ambition.
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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
Which of the following statements best describes the organization of the passage
A．Statement illustrated by an analogy.
B．A hypothesis supported by documentation.
C．A comparison of two contrasting theories.
D．A critical analysis of a common assumption.
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