Đáp án tham khảo có thể sai: 1a, 2d, 3d, 4a, 5d, 6b, 7a, 8b, 9a, 10b, 11b, 12d, 13d, 14d, 15b, 16c, 17c, 18c, 19d, 20d, 21b, 22c, 23d, 24b, 25c, 26c, 27c, 28c, 29c, 30c, 31b, 32b, 33a, 34d, 35b, 36c, 37c, 38a, 39b, 40c, 41c, 42b, 43a, 44b, 45c, 46a, 47b, 48a, 49c, 50b, 51a, 52c, 53c, 54c, 55b...