Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

[EX Q]: An extremely helpful gem on a complex subject of second century religious authority and textual use. For anyone serious about this period and the interelation of cultures, this book is essential. Is it complex and detailed? Of course, it must be to argue the point. Should you buy it? Yes, unless you want to keep running back to the library. I write this only after thoroughly disagreeing with the review above.
[EX A]: Positive

[EX Q]: If you did not know it starred a very young Mel Gibson, you would have never believed that it was really him. This movie was a really good revenge movie. The only problem I had with it was trying to make out what was being said. It is done in "Australian language" and, though it is basically English, the accents of most except for Mel Gibson's character are so strong that you really have to over-listen to try and figure out what is being said. Other than that, the movie was a good movie and the crash scenes were fantastic for the era in which it was made. I only wish I could have understood what everyone was saying without straining in order to get even half of the dialogue. But, it is a movie well worth viewing.
[EX A]: Positive

[EX Q]: I just finished reading this book and I think it is one of the best books I ever read. This book tracks the voyage of a Cromagnon girl who lives in a clan of neanderthals. This clan adopts her as a member of it. This book is about how the clan accepts her and learns to deal with her differences. This book is not only a great story but it is scientifically accurate. I would call this book a scientific saga.
[EX A]:
Positive