WHAT IS ONE OF THE CHIEF REASONS WHY BIRDS SING

6. - DE KIEM TRA 1 TIET TIENG ANH 10 BAI SO 2 HK2
DE KIEM TRA 1 TIET TIENG ANH 10 BAI SO 2 HK2
6. What is one of the chief reasons why birds sing?A. They are happy. B. They are in good temper.C. They want to talk something. D. They can sing many songs.