一些简单的英语、数学题

题目

一些简单的英语、数学题
A.英语
根据句意及首字母提示补全句子
Everyone wants to get a higer e_____
That is a d____ story.I don't like it.
句型转换
Mike didn't stay at home tow hours ago(改为同义句）
Mike wasn't ______ tow hours ago
The flowers are very beautiful.(改为感叹句）
______ ______ ______ they are!
已知△ABC中,AB=AC,F在AC上,在BA的延长线上取AE=AF.求证EF⊥BC（有6中解法）

答案

earings,deceptive,in,What beautiful flowers.
AB=AC 故 角B=角C,AE=AF,故 角E=角AFE,角BAC=2倍角E,2倍角B+角BAC=180度,则角B=二分之一角=90度即角B=角E=90度,即EF垂直于BC