单项选择题

A．To attract more sea animals to the testing site.
B．To drive dangerous sea animals away from the testing site.
C．To help track the sea animals being tested.
D．To determine how sea animals communicate with each other.
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单项选择题
A．30%.B．35%.C．37%.D．39%.
A．30%.
B．35%.
C．37%.
D．39%.
单项选择题
A．The loudness of the sound waves.B．The fear of sea animals.C．The fear of the confusion and harm caused by sound waves.D．The noise of the experiment.
A．The loudness of the sound waves.
B．The fear of sea animals.
C．The fear of the confusion and harm caused by sound waves.
D．The noise of the experiment.
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