Question 17-20: Read the following passage and circle the letter A, B, C or D to indicate the answer to each of the following questions.

Stamps collections is an interesting hobby. You can learn many things, such as the geography of a country from stamps. Postal stamps are a source of interesting facts and important dates about every country in the world. It makes stamp collecting become very popular.
As you look at the pages of a stamp album you can learn interesting details o foreign customs, arts, literature, history and culture. Their colors can make you feel relaxed and happy.
Collecting stamps can become a business. If you are lucky in finding a special stamp, it brings you some money besides knowledge and pleasure.

Stamp collecting is an interesting hobby because________.