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_________ unusual experience you had in the USA!

A. What a B. What an

C. What D. How

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Do you like listening to music? Do you often turn up the music when you’re using earphones? If so, your hearing may have been damaged(損壞).

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Dr. Krug said keeping the music down and limiting (限制) the listening time to less than one hour a day would save a lot of people's hearing. However, he also said, "Even an hour can be too much if the music is too loud.” Ralph Holme, a researcher, explained how loud noise can damage ears. He said: "Loud sounds damage your hearing by killing off thousands of little hair cells(細胞) in the inner ear. The cells can tell different sounds through vibration(振動). But they are very fragile — they get damaged easily and even die if they vibrate too much because of loud sounds for too long.” He warned: "The bigger problem is they don't grow back and the ear can no longer get sound."

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C.young people lose their hearing because of going to the nightclubs

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