第5部分：补全短文(第46～50题，每题2分，共10分)
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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 music alinstruments cannot harm your health．