单项选择题

The primary purpose of this passage is to ______.

A．argue for a ban on the capture of whales and dolphins
B．describe the evolution of whales
C．report a possible explanation for the lack of teeth marks on whales' victims
D．reveal the flaws in the "big bang" theory of cetacean predation

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单项选择题

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

A．direct
B．lessen
C．move to middle
D．use

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