Tom, a 15-year-old boy, couldn't hear anything after the whole night computer games and MP3 listening．He was excited and yelled(喊叫)after the MP3．When he walked out of his room the next morning, he could hear nothing about his mother's words．His mother sent him to the doctor at once．It was moderate(中度)hearing loss(耳聋)．
Do you have an MP3 player? Do you use it to listen to your favorite music? A survey shows that lots of young people enjoy listening to their MP3 players．And they always listen to them at high volumes(音量)．There are about 100 million people listening to MP3 players in Europe every day．Most of them are young people．Scientists have found that if people listen to MP3 players at a very high volume for more than five hours a week, they could lose their hearing in five years．
High-volume music can keep people excited, so young people would like to keep their players high．It's too bad for the ears．So the MP3 listeners should keep the player within safe volume levels, no higher than 60～70 of full capacity(容量)．If people near you can hear your MP3, that means you are keeping your MP3 at a very high volume, turn it down, please!
(1)
What didn't Tom do before he had moderate hearing loss?
[ ]
A．
He played the computer games．
B．
He yelled after the MP3．
C．
He listened to the MP3．
D．
He went to see the doctor．
(2)
Who enjoys MP3?
[ ]
A．
Young people．
B．
Adults．
C．
No one．
D．
Scientists．
(3)
What's the safe volume of the MP3?
[ ]
A．
People beside you can hear your MP3．
B．
No higher than 600-/o of full capacity．
C．
You can't hear it clearly．
D．
Keep the full capacity．
(4)
Why do the young people keep the players high?
[ ]
A．
Because the people near them can't hear it．
B．
Because the young people want to surprise others．
C．
Because the high-volume music can keep them excited．
D．
Because the young people want to have hearing loss．
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