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　　Ⅰ.阅读理解

　　People should listen to music for no more than one hour a day to protect their hearing, the World Health Organization suggests.

　　It says 1.1 billion teenagers and young adults are at risk of permanently damaging their hearing by listening to "too much, too loudly". WHO figures show 43 million people aged 12－35 have hearing loss and this number is increasing. In that age group, half of people in rich and middle­income countries were exposed to unsafe sound levels from personal audio devices. Meanwhile 40% were exposed to damaging levels of sound from clubs and bars. The percentage of US teenagers with hearing loss went from 3.5% in 1994 to 5.3 % in 2006.

　　Dr Etienne Krug, the WHO's director for injury prevention, told the BBC，"What we're trying to do is raise awareness of an issue that is not talked about enough, but has the potential to do a lot of damage that can be easily prevented. "The full report argued, "While it is of vital importance to keep the volume down, limiting the use of personal audio devices to less than one hour a day would do much for reducing noise exposure."

　　The World Health Organization recommends keeping the volume to 60% of the maximum as a proper way for listening. For people on plane or train, it says noise­cancelling (降噪) headphones allow music to be heard clearly at a lower volume. And the WHO adds that earplugs (耳塞) should be worn at noisy places and advises taking "listening breaks" now and then.

　　"We do realise that many risk factors linked to pleasure are not easy to change, but we have to make people aware，" Dr Krug said.

　　But as well as calling for personal responsibility，the WHO says governments and companies have a responsibility. It says clubs should provide relaxing rooms and give out free earplugs, headphone companies should set limits on the volume, and governments need to adopt stricter laws.

Paul Breckell, the chief executive of the charity Action on Hearing Loss, said，"When listening to loud music, for every three decibels (分贝) increase in level, to stay safe you should cut half of your listening time."