books.google.com - World of Science is ideal for teaching mixed-ability classes. Each students' book is differentiated into three main levels with a molecule symbol denoting the demand each task places on the student.The content-based approach ensures that a unit covers all the student needs to know for exam success and...http://books.google.com/books/about/World_of_Science.html?id=IEfzrFNicNkC&utm_source=gb-gplus-shareWorld of Science
