1.B 2.D 3.B 4.B 5.A 6.D 7.A
1.ABDE 2.ABCDE 3.AC 4.CDE 5.ABD 6.ABE
1.× 2.× 3.√ 4.√ 5.× 6.√ +xhNfXDr0vAAZ0eJ4Df/CruDo1IhxoMxAtg68Xnmw/C/S++4+2s6aKY3f6ptAyRJ