WHAT WARNING DOES A BIRD SOMETIMES SING

8. - DE KIEM TRA 1 TIET TIENG ANH 10 BAI SO 2 HK2
DE KIEM TRA 1 TIET TIENG ANH 10 BAI SO 2 HK2
8. What warning does a bird sometimes sing?A. A warning to keep calm. B. A warning to come quickly.C. A warning about the approach of people. D. A warning to stop singing.