One of the differences between some whales
and dolphins is that ... .
A) whereas all dolphins have teeth, some big
whales don't
B) whales don't provide milk for their young, but
dolphins do
C) although dolphins have lungs for breathing,
most whales don't
D) while all dolphins are warm-blooded, whales
are cold-blooded
30.
According to the passage, we can infer that
dolphins ...
A) don't breathe underwater
B) have difficulty surviving in captivity
C) use only one lung at a time
D) are among the largest sea animals
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