【单选题】Listening out for whale song is one way that ships can avoid colliding with whales. But what do you do if the whales aren't singing? One answer, developed by researchers in the Canary Islands, is to f...
A.
are the only Whales that can sing songs
B.
are the only whales capable of masking the clamour of ocean noise
C.
provide clues to scientists to study sea currents and waves