题目

写出下列缩写词的完全形式① I'm ②you're ③he's ④ she's ⑤ it's ⑥ what's ⑦name's ⑧ telephone number's 答案：【1】I am【2】you are【3】he is【4】she is【5】it is【6】What is【7】name is【8】telephone number is如图，已知AC⊥BD于C，CF=CD，BF的延长线交AD于点E，且AC=BC．求证：（1）∠1=∠D；（2）BE⊥AD．