Final answer:
A good rule of thumb for determining whether a book is appropriate for partner reading is the length of the book, as well as considering the reading level and interests of both partners.
Step-by-step explanation:
A good rule of thumb for determining whether a book is appropriate for partner reading is the length of the book. If the book is too long, it may be difficult for both partners to read and discuss it within a reasonable time frame. It is also important to consider the reading level and interests of both partners to ensure that the book is engaging and accessible for both of them.
For example, if one partner is a struggling reader, it would be more appropriate to choose a shorter book with simpler language. On the other hand, if both partners are strong readers, they may be able to tackle a longer and more complex book.
In addition to the length, it is also important to consider the content of the book. The teacher's preference should not be the sole determining factor, but it can be a helpful guide to ensure that the book aligns with the curriculum or educational goals.