Метан ==>А==> метанол==>Б==>метанова кислота==>карбон(lV) оксид.
Букви А і Б невідоме, напишіть будьласка ці невідомі формулой)

Помогите , очень срочно !!!!!

..One of my friends gets ill very often. The doctor says that it's because he lives in a big city with a poor environment...
What ecological problems are the most serious in your country? What can teenagers do to make their hometown cleaner? Would you like to live in a big city or in the country, why?

Write her a letter and answer her 3 questions. Write 100–120 words. Remember the rules of letter writing.