We need rivers. They bring water from mountains to oceans. They also bring water to lakes.Snow falls on mountains. Then it melts. The water runs down the mountain. Now, it becomes a river. It travels to oceans or lakes.The longest river in the world is the Nile. It is in Africa. You can take a boat down the Nile.Some rivers flood. This can be good for farmland. But it is bad if a river floods your house. Some people pollute rivers. This hurts the water, plants, and animals.Do you have a river in your town? Where did it come from? You can help to keep it clean. Pick up trash in the river. Thank it for bringing you water.河流我们需要河流。河流把水从山上带到海洋里，它们还把水带到湖里。雪落在山上。然后融化。水顺着山流下来。现在，它变成了一条河，流向湖泊或海洋。世界上最长的河流是尼罗河。它在非洲。你可以乘船沿尼罗河而下。有些河流泛滥。这对农田有好处。但是如果河流泛滥淹没了你的房子，那就不好了。有些人污染河流。这会伤害水、植物和动物。你们镇上有河吗？它从哪里来的？你可以帮忙保持河流干净。捡拾河里的垃圾。谢谢它给你送水。【注释】
melt（使）熔化，融化
flood泛滥；淹没
farmland农田；耕地
pollute污染；弄脏
trash废物；垃圾
读完这篇短文，来回答个问题吧！How can you help to keep a river clean?a. pick up animalsb. pick up trashc. pick up waterd. pick up boats你可以留言告诉我你的答案哦！Now it's your time to open your mouth and follow me! 张开嘴巴跟着录音练起来！
