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. The ancient world had seven 'wonders' - amazing things made by people. Today, people don't agree about what the biggest wonders are. What do you think is a wonder? Use your unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1626. Lexile Reading Level: 680L.