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According to the writer, it isn't necessarily true that

1. 
   mediocre jokes are only laughed at by people with no sense of humour
   
2. 
   people with a keen sense of humour never overreact
   
3. 
   a person who is aware of his weak sense of humour will always overreact
   
4. 
   some jokes are better than others
   
5. 
   the longer a person laughs, the keener his sense of humour
   

2. 
   Those with a really keen sense of humour.
   

1. 
   never show it through laughter
   
2. 
   tell mediocre jokes to make other people overreact
   
3. 
   don't appreciate the company of those with a poor sense of humour
   
4. 
   are able to distinguish between good and bad jokes
   
5. 
   will laugh for a long time at a truly humorous joke
   

3. 
   The writer believes that by overreacting to a joke
   

1. 
   some people are trying to hide the shortcomings in their sense of humour
   
2. 
   you make the person who told it feel inadequate in some way
   
3. 
   you spoil the humour for other people
   
4. 
   a person can demonstrate how mediocre it is
   
5. 
   a person shows how discriminating he is about humour
   

5 ALPINE FORESTS
Forests are the lifeguards of the snowy peaks of the Alps. They provide a natural barrier against avalanches and landslides, but the skiing industry, which proved a boon for poor Alpine farmers, is damaging the environment. Forests have been felled to make way for more ski runs, car parks, and hotels, and Alpine meadows have been abandoned by farmers keen to exploit tourism. Consequently, the avalanche has now become a common phenomenon. Forestry experts estimate that two-thirds of the several thousand avalanches that descend into inhabited parts each year are the result of forest depletion.

1.