Tham khảo tài liệu 'mastering skills for the toefl ibt advanced part 99', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | READING LISTENING SPEAKING WRITING l-i 00 00 00 Question Preparation time Preparation time 30 seconds Response time 60 seconds The professor discusses how different languages originated from one proto-language. Describe this process and explain the two stages a language undergoes to become multiple languages. ya 5 E 5 Q 3 ffï TJ 2 z 0 a z -0 m ri Practice Test 689 -------------