能源与自然相关词汇 — 英语填空题
题目
Read the clues and fill in the blank. It is a kind of clean energy from nature. You cannot see it or hold it, but you can watch it move the leaves on trees and push the sails of boats. When it blows hard, kites fly high in the sky. What kind of energy is it? It is ___ energy. (提示：一种来自流动空气的清洁能源)