单选题：An ultrasonic sound__________.

题目内容：

An ultrasonic sound__________. A．is very loud
B．does harm to people's health
C．is produced by the hero in movies
D．cannot be heard by people

参考答案：

答案解析：

What does the author say about music?

What does the author say about music?A．It may be harmful to people's health. B．I

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