0|show" data-onresultcheck="*redo|*.na|hide@*correct|*.na|hide@*reset|*.na|hide"> "Hey man -- can you turn your music down?" If anyone says this to you while you’re wearing your earbuds, please note: You are probably harming your hearing. More than one billion teens and young adults are at risk of losing their hearing, according to the World Health Organization, or WHO. It’s not just old people who suffer hearing loss. Just by listening to music at what you probably think is a normal level, or having fun in loud bars, nightclubs and music and sporting events, your hearing can be lost forever. By analyzing listening habits of 12- to 35-year-olds in developed countries around the world, the WHO found nearly 50% of those studied listen to unsafe sound levels on personal listening devices and about 40% listen to music at damaging levels in entertainment events. It doesn’t take much time to damage your hearing at a sports bar or nightclub. According to the WHO, when the noise level reaches 100 decibels in such events, it is safe for no more than 15 minutes. A decibel is a unit used to measure how loud a sound is. 4. What did the WHO study find about young people in developed countries?
A、15% of them like to go to bars and nightclubs for fun.
B、Nearly half of them carry personal listening devices around.
C、35% of them have the habit of going to sporting events.
D、About half of them listen to music above safe sound levels.