Unit 4 –⁠ 2.1 solution

2.1 Answer some questions:

• Which other materials, apart from natural, are used for construction? 
  Apart from natural materials, many man-made products are used for construction.
  
  
• Into how many categories are building materials generally divided? 
  They are divided into two categories.
  
  
• Into which category do stone and wood belong (belong = patří)?
  They belong to natural building materials.

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