题目内容：
回答(50)题
A．High sound of 150 decibels can kill a healthy rat. B．The vibration of air can produce infrasonic waves.
C．We cannot play high-pitched music with ordinary musical instruments.
D．If the intensity of infrasonic wave exceeds 160 decibels, it is extremely harmful.
E．Dolphins, whales and bats can make such high-frequency sound.
F．Therefore, the sound of ordinary musical instruments cannot harm your health.
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