单项选择题

A．fixed
B．set
C．founded
D．based
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单项选择题
A．adoptedB．expressedC．proposedD．executed
A．adopted
B．expressed
C．proposed
D．executed
单项选择题
What was the reason that made the experiment nearly cancel
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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