Psychologists suggest that to cure cruelty

1. The effect of loud noise, as stated in the passage

1. 
   is not always noticed before it has already damaged the ear
   
2. 
   is greater as people become older
   
3. 
   caused by commercial jets is irreparable
   
4. 
   is more damaging for the ear than anything else
   

2. The normal process of hearing loss

1. 
   can start at any age, depending upon the condition of the person's ears
   
2. 
   can be sped up by the harm done by loud noise
   
3. 
   occurs if the person is frequently subjected to loud noise
   
4. 
   is noticed only when irreplaceable hair cells in the inner ear have been killed
   

E) is caused when sound levels from machines reach 115 decibels or more

3. Unable to hear the music their child is listening to on a headset, parents …

1. 
   are advised not to buy one for their child
   
2. 
   can't easily understand what kind of music he is interested in
   
3. 
   are advised to take the child to the doctor more frequently to have his ears checked
   
4. 
   don't have the opportunity to control the intensity of the sound