题目

对话填空  （满分10分）        请认真阅读下列对话，并根据各题所给的首字母的提示，在答题卡右栏中标有题目的横线上，写出一个英语单词的完整、正确的形式，使对话通顺。 ---Excuse me, Madam, but I’m writing a report on what people prefer to do onholiday. Do you mind if I ask you a few questions? ---No, not at all. Please go （76）a_______. ---How often do you go on holiday? ---I usually have two weeks’ holiday a year. ---And what do you prefer to do when you are on holiday? ---Well, I don’t usually visit my family.如图，已知在△ABC中，∠BAC为直角，AB=AC，CE⊥BD于E．（1）若BE平分∠CBE，求证：BD=2EC；（2）若D为AC上一动点（不与C，A重合），则∠AED的大小是否变化？若变化，求出变化范围；若不变，求出大小．