Paragraph One The oil drilled and pumped from underground holds the energy of eons’ worth of sunlight energy collected by plants and stored as organic matter. Over millions of years of heat and pressure, the energy in that organic matter has been further concentrated to yield hydrocarbons such as oil, natural gas, and coal. 36. F____ of fossil fuels.
【正确答案】：Formation
【题目解析】：题干主要描述的是化石能源的形成，横线上缺少的是“形成”所以是Formation。
