注意首字母的大小寫，不含標點符號 __1___ had been used for hundreds of years to operate ___2___ and to pull carts, wagons, and other vehicles. The sun's energy takes water from rivers, lakes, and oceans and returns it to the earth ___3___or snow. When rain or snow falls ___4___, some of it flows into rivers and streams.
The energy from animals farm equipment in the form of rain on the land