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Paragraf Tamamlama 69. Soru

birinci Bu Testin Birincisi Bengu
Başarı Yüzdeniz : 100 %
69.
……….. . Known as fossil fuels, they took about 250 million years to form, and although new coal and oil are being formed in parts of the world, this happens very slowly, so the coal and oil now being extracted at an extremely fast rate are not being replaced. This means that alternative energy sources must be found and developed.


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