单项选择题

As used in the passage, moderate most nearly means ______.

A．direct
B．lessen
C．move to middle
D．use
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单项选择题
What is the big bang theory of cetacean predation ______.
A．Sixty-eight species of odontocetes use sound to locate their victims
B．Toothed whales use sound as weapons
C．Whales and humans have vestigial structures
D．Whale teeth, once sharp, have become somewhat short and uneven
单项选择题
It can be concluded from the passage that the big bang theory is ______.
A．a fact
B．a disproved hypothesis
C．an unsupported opinion
D．an idea with some supporting evidence
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