题目

首字母填空（10分） Hi! My (1)n______ is Linda. I am 12 years (2)o_______. I (3)s________ at No. 2 Middle School. I go to school (4)f________ Monday to Friday .My favorite day is (5)F________. We have art and P.E. lessons and we have beef for lunch. Beef is my favorite (6)f__________. My favorite (7)t________ is Miss White. She is our (8)E________ teacher. She has (9)1________ hair. She loves (10)m__________. She often sings for us. 1.____________    2._______________   3. ____________  4. ____________  5. ___________ 6.____________    7._______________   8. ________如图，AD是△ABC外角∠EAC的平分线，交BC的延长线于点D．延长DA交△ABC的外接圆于点F．（1）求证：FB=FC；（2）若FA=23，AD=43，求FB的长．