Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An excellent book but too easy and unexplained!

Doctor Dolittle is the story of a famous animal doctor from a town called Puddleby-on-the-Marsh. He has the amazing ability to talk with animals. One day, he is asked to go and help monkeys in Africa with a deadly disease. The story continues to unravel into a large, yet unexplained and jumpy adventure. Although we did not understand some of the parts, we enjoyed the book.Younger readers would enjoy it more (Grades 3-4)