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Răspuns:
1.b, 2.c, 3.b, 4.a, 5.b, 6.c, 7.b, 8.a, 9.c, 10.a, 11.b, 12.c, 13.b, 14.b, 15.b, 16.b, 17.c, 18.a, 19.b, 20.c