这个和our world 有相似, 但不一样, 目前只找到前三个level, 有兴趣的可以下来看看. 扫描件, 不喜匆下.

Explore Our World is a light and lively primary series in American English. It focuses on listening, speaking, and pronunciation activities, supported by fun and fascinating National Geographic content, images, and video, to ensure young learners of English have the essential language, skills, and knowledge they need to understand their world.