The textbook contains three levels of tasks concerning vocabulary, grammar, phonetics, semantics, and stylistics. Some tasks need not only knowledge, but also thinking, as we suppose to teach students analytical ability, the capacity to deduce knowledge, for example, to guess the meaning of the word from its morphological structure.
For students of different stages longing to improve their English. Это и многое другое вы найдете в книге Three Level Textbook to "Three Men in a Boat" (+ CD-ROM) (А. Павлова)