Trắc nghiệm: According to scientists (A) who study birds.(B) upon hatching.(C) ducklings have already known to swim.(D) | Gửi trắc nghiệm |
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Trắc nghiệm: According to scientists (A) who study birds.(B) upon hatching.(C) ducklings have already known to swim.(D) | Gửi trắc nghiệm |