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.
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单项选择题
A．Income affects happiness very much.B．Income affects happiness very little.C．Happiness affects income very much.D．Happiness affects income very little.
A．Income affects happiness very much.
B．Income affects happiness very little.
C．Happiness affects income very much.
D．Happiness affects income very little.
单项选择题
A．To determine whether the Earth’s temperature is going up.B．To study the behavior of some sea animals.C．To measure the depth of the ocean.D．To measure the movement of the ocean.
A．To determine whether the Earth’s temperature is going up.
B．To study the behavior of some sea animals.
C．To measure the depth of the ocean.
D．To measure the movement of the ocean.
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