4 ．辅音［ s ］是 (       )

A. 塞音                                                            B. 擦音     

C. 塞擦音                                                        D. 边音

5 ．汉语普通话系统中没有发音部位 (       )

A. 双唇                                                            B. 舌叶     

C. 唇齿                                                            D. 舌面前

6 ．按“四呼”来给汉语音节中的韵母归类， ang 属于 (       )

A. 开口呼                                                        B. 齐齿呼

C. 合口呼                                                        D. 撮口呼

7 ．下列各组词中全部属于派生词的一组是 (       )

A. 木头、孔子                                                 B.