题目

阅读对话，判断正(√)误(×)。Grandma: What are you doing, John?John: I’m making a birthday chart (图表) for our family. When is your birthday, Grandma.Grandma: It’s in May.John: That’s fun. My mother’s birthday is in May, too. Are they on the same day? Grandma: No. Your mother’s birthday is on the fifth and my birthday is on the fifteen.John: When’s Grandpa’s birthday?Grandma: It’s in June.John: There are three birthdays in June. They are Grandpa’s, Uncle Bill’s and mine. When is Aunt Mary’s birthday?Grandma: Her birthday is in November. Your cousin Alice’s 18．△ABC中，∠ABC、∠ACB的平分线相交于点O，过点O作EF∥BC分别交AB、AC于E、F．（1）求证：OE=BE；（2）若△ABC的周长比△AEF的周长大10，试求出BC的长度．