Đáp án tham khảo có thể sai: 1d, 2d, 3c, 4b, 5a, 6d, 7a, 8c, 9b, 10c, 11a, 12a, 13a, 14b, 15a, 16a, 17c, 18c, 19b, 20b, 21d, 22a, 23c, 24d, 25d, 26d, 27c, 28b, 29a, 30b, 31d, 32d, 33a, 34c, 35c, 36d, 37a, 38c, 39a, 40a, 41b, 42b, 43a, 44d, 45d, 46d, 47d, 48a, 49c, 50c, source : OSG202_FA23_FE_167432