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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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.
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
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