Đáp án tham khảo, có thể sai: 1d, 2a, 3b, 4c, 5d, 6ac, 7a, 8a, 9d, 10a, 11a, 12c, 13c, 14d, 15d, 16c, 17c, 18a, 19b, 20c, 21d, 22a, 23d, 24a, 25a, 26a, 28d, 29c, 30c, 31abc, 32a, 33a, 34a, 35b, 36b, 37a, 38a, 39a, 40a, 41a, 42a, 43a, 44c, 45c, 46a, 47a, 48a, 49a, 50a, 51a, 52a, 53a, 54a, 55a...