单项选择题

What does the word "ambiguity" in Sentence 4, Para.2 mean
A) Certainty. C) Clarity.
B) Vagueness. D) Ambition.

A．What does the word "ambiguity" in Sentence 4, Para.2 mean
B．Certainty.
C．Vagueness.
D．Clarity.
E．Ambition.
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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 on investigations of the moon and planets
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.
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