Đáp án tham khảo, có thể sai: 1d, 2d, 3b, 4a, 5d, 6d, 7d, 8c, 9d, 10b, 11c, 12c, 13a, 14c, 15b, 16b, 17b, 18b, 19b, 20a, 21a, 22a, 23d, 24c, 25abc, 26d, 27d, 28c, 29b, 30d, 31d, 32b, 33c, 34b, 35a, 36a, 37d, 38b, 39e, 40a, 41c, 42d, 43a, 44d, 45bc, 46ab, 47e, 48b, 49e, 50b, source : NWC203c - FE...