21.Which of the following statements is correct?                                                                                       

The affricates [tS ] and [ dZ ]  are

               A. consonants produced with a continuous airflow through the mouth

B. consonants produced with the lowering of the soft palate

C. consonants produced with the complete stoppage of the air in the mouth which        causes explosion   

D. produced with an initial stop then with a slow separation of the tongue to make                 friction

Tìm sự khác nhau trong cảm nhận về đất nước của Nguyễn Khoa Điềm và Nguyễn Đình Thi qua bài Đất Nước