I ________ a book on fashion at this moment，and it ________ in the book that Europeans started to

wear top hats in the early 1800s.[ ]

A．read；is said  

B．am reading；is saying

C．was reading；was saying  

D．am reading；says

甘丹寺被称为西藏佛教后弘的发祥地，在整个藏传佛教历史上占有重要地位。