单项选择题

For whom is the author probably writing this passage

A．Train engineers.
B．General audiences.
C．Professors of statistics.
D．Young children.
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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 word ambiguity in Sentence 4, Para.2 mean
A．Certainty.
B．Vagueness.
C．Clarity.
D．Ambition.
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