A. purchase B. ladder C. forest D. policeĐoạn văn3/50Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions. purchaseladderforest policeGiải thíchĐáp án D A. purchase /'pз:tʃǝs/ B. ladder /'lædǝ(r)/ C. forest /'forɪst/ D. police /pǝ'li:s/