The book consists of fifteen units. Each unit is composed of five reading
selections. The first reading selection of each unit includes 155 words. The
second reading selection in each unit includes 237 words, the third reading
selection 379 words, the fourth one 442 words, and the last one 826
words. All the reading selections have a Flesch-Kincaid grade level of 11 to
12, meaning that they are suitable for intermediate to advanced learners