题目

 Dressed untidily and speaking in a strange way, Father must have ______ to the people present to be a silly old man. A. appeared        B. pretended        C. shown        D. thought 答案：C下列电器的原理与电动机的原理相同的是A.动圈式话筒B.发电机C.动圈式音箱D.电铃