题目

 Your son is old enough to______himself.Don’t always do everything for him. A.wear                                                             B.dress C.put on                                                         D.have on 答案：B   dress oneself乔装打扮某人自己。合唱中“高音声部”和“低音声部”中的“高”和“低”是指           (      )A．响度。B．振幅。C．音调。D．音色。