2011年卫生类职称英语辅导教材补全短文第2篇

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.
答案：1.A 2.F 3.E 4.B 5.D