I replied this above but I think it also stands here:

Sometimes we assign portions of books if the focus is on a specific area of content. We review throughout the year. So for instance, I give my students a model paragraph but instead of their first review being of the content in the paragraph, I make it about something silly. Teachers are constantly trying to engage kids in learning in new ways. I’ll tell you, I teach high schoolers and they give zero f’s a lot of the time. I have a high level class and then a lot of kids reading at elementary school level in the same class. So it’s really tough to deem an assignment too basic. I’m trying to get around that with differentiation but it’s a beast.