题目

小作文（简单自我介绍：包括姓名name，性格outgoing开朗的，兴趣love like）不少于五句话。 答案：I am 15 years old now and I am a student in a Middle school. My height is about 1.6 metres. My friends tell me that I am too slim and need to have more sports to be stronger. I have big eyes and big ears. My friends say I am a handsome guy in the class. I am very outgoing. Playing basketball is my favourite sport and I have played for many years. I will play computer games in my spare time. 如图，△ABC是直角三角形，且∠ABC=90°，四边形BCDE是平行四边形，E为AC的中点，BD平分∠ABC，点F在AB上，且BF = BC. 求证：（1）DF = AE； （2）DE⊥AC