Think about the different ways that people use the wind. You can use it to fly a kite to sail a boat Wind is one of our cleanest and (rich) power sources, as well as one of the oldest. Evidence shows that windmills (风车) (begin) to be used in ancient Iran back in seventh century BC. They were first (introduce) to Europe during the 1100s, when armies returned from the Middle East with knowledge of (use) wind power.
For many (century), people used windmills to grind (磨碎) wheat into flour or pump water from deep underground. electricity was discovered in the late 1800s, people living in remote areas began to use (they) to produce electricity. This allowed them to have electric lights and radio. Today, there is a (globe) movement to supply more and more of our electricity through the use of wind.
