基本信息
[2011·安徽卷] think about the different ways that people use the wind.you can use it to fly a kite or to sail a boat.wind is one of our cleanest and richest power sources(来源)，as well as one of the oldest.evidence shows that windmills(风车)began to be used in ancient iran back in the seventh century bc.they were first introduced to europe during the 1100s，when armies returned from the middle east with knowledge of using wind power.
