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The word "it" in the first paragraph refers to
" có trong những liên kết dưới đây, nhấp chuột để xem chi tiết:Read the following passage and mark the letter (A, B, C or D) on your answer sheet to indicate the correct answer to each for the questions.Although noise, commonly defined as unwanted sound, is a widely recognized form of pollution, it is very ... (Tiếng Anh - Lớp 12)
Nguyễn Thanh Thảo - 02/09 22:15:24