单项选择题

WACS can reduce the whale collisions by ______.

A．warning whales to get away from passing ships
B．attacking ambient noise imaging tags onto the whales
C．directing passing ships to turn away from the whales
D．teaching the whales to send signals to the passing ships

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热门试题

单项选择题

The ambient noise imaging is able to locate the whales even when they are silent because ______.

A．the whales may create detectable "sound shadows"
B．the new sonar equipment is more powerful
C．the new sonar technology can see through sea water
D．the existence of whales may reinforce reflection signals

单项选择题

The loss of one or two northern fight whales every year is considered an unaeeeptable loss because they ______.

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
D．are on the very verge of distinction