人们是怎么知道地球是圆的的？你也许会说是哥伦布航海发现的，但其实远在古希腊时期就有了地球是圆的的理论。 从船上的?t望台能看到在甲板上看不到的远方，月相变化，时差的产生，不同地方的人能看到不同的星空等等，这些都表明地球是圆的。 这本英语原版科普绘本提供了丰富有趣的知识，穿越历史，进入太空，启发孩子观察、思考有关地球形状的现象与知识，培养孩子独立思考的精神。 书后有简单的小实验，引导孩子自己动手、观察。
Explore one of the most recognized scientists in the world with this biography of physicist Albert Einstein. Kids will learn about his life, achievements, and the challenges he faced along the way. The level 3 text provides accessible, yet wide-ranging, information for independent readers.
Water is all around us; we drink it every day. In this level 3 reader, kids will learn about the water cycle, discovering how rain and snow flow into our lakes, rivers, and oceans, and later evaporate into the sky again. Vivid photography and accessible text make this book an ideal introduction to the science of water.
Learn all about Thomas Edison, one of the most important figures in American history, in this colorful, inviting, and entertaining biography. This carefully leveled reader is written in an easy-to-grasp style to encourage the inventors of tomorrow!
