题目

矩形ABCD中，AD＝ AB，AF平分∠BAD，DF⊥AF于点F，BF交CD于点H.若AB＝6，则CH＝（） A . B . C . D . 答案：D －You know, Bob is a little slow _________ understanding, so… －I have to be patient _________ him． [　　] A． in; with B． on; with C． in; to D． at; for