Psychologists suggest that to cure cruelty

It doesn't date far back, according to the passage, that

1. 
   a fine thread was obtained by unwinding the cocoon of a silk-worm
   
2. 
   a Frenchman produced a silk-like fiber
   
3. 
   man discovered certain natural organic materials from which they produced fine threads
   
4. 
   man began to produce fibers entirely artificially
   

2. 
   Synthetic fibers
   

1. 
   were first produced by the Chinese
   
2. 
   are produced from organic materials
   
3. 
   are growing in number almost every year
   
4. 
   have been given similar names
   

3. 
   According to the writer's statement,
   

1. 
   hardly anyone today seems too eager to use anything made from nylon
   
2. 
   synthetic fibers were much more popular when they were first produced than they are today
   
3. 
   nylon products are used in everyday life by almost everybody
   
4. 
   artificial materials are used more than natural ones