Cambridge Discovery Education Interactive Readers are the next generation of graded readers - captivating topics, high-impact video, and interactive exercises designed to motivate and engage. You are alone and lost in the wilderness, and you need to survive. Get tips on how to stay warm, find food, and stay alive! Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 2407. Lexile Reading Level: 740L.