ANSWERS :
1:C; 2:A; 3:A; 4:D; 5:A; 6:C; 7:C; 8:C; 9:D; 10:C; 11:D; 12:A; 13:A; 14:A; 15:B; 16:C; 17:D; 18:C; 19:B; 20:D; 21:B; 22:D; 23:D; 24:B; 25:D; 26:B; 27:B; 28:C; 29:B; 30:A; 31:D; 32:A; 33:A; 34:C; 35:B; 36:D; 37:B; 38:D; 39:D; 40:A; 41:A; 42:B; 43:C; 44:C; 45:A; 46:C; 47:C; 48:B; 49:C; 50:C; 51:B; 52:D; 53:A; 54:B; 55:C;