●     内容： 一篇关于水循环（Water Cycle）的科普文章，描述水的不同形态（固态、液态、气态）及其未来的变化。

●     选材理由： 该主题借鉴了低龄科学故事中“水的状态”这一主题，但在语言和概念深度上进行了升级。文章将大量使用will和be going to来描述水的未来状态或预测，从而强化对未来时态的掌握。

●     语法重点： 未来形 (will and be going to)。

课文：

I am a small drop ofwater, and I am going on a long journey. Right now, I am in a big, blue lake.But the sun is going to shine on me soon. When the sun gets hotter, I willbecome a gas and rise into the sky. I will join billions of other drops to forma cloud. In the sky, it will be very cold. My cloud is going to get bigger andbigger. When it gets too heavy, the drops will fall to the Earth again as rain.I might fall on a mountain, and then I will become part of a stream. Thisstream is going to flow down the mountain to a bigger river. The river willthen take me back to the ocean, and I will begin my journey all over again.