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1)общий вопрос
2)специальный вопрос
3)вопрос к подлежащему
4)альтернативный вопрос
5)разделительный
They export their computers to many countries of the world.

1) Do they export their computers to many countries of the world?2) What do they export to many countries of the world?3) Who export their computers to many countries of the world?4) Do they export their computers or mobile phones to many countries of the world?5) They export their computers to many countries of the world, don't they?