挑战习题
1/5单选题
难度:

1.如图,在下列条件中:①1=∠2;②∠BAD=∠BCD;③∠ABC=∠ADC且∠3=∠4;④∠BAD+∠ABC=180°,能判定AB∥CD的有(    )
A 3个
B 2个
C 1个
D 0个
提示1:
4pGg55Sx4oigMT3iiKAy77yM5Yip55So5YaF6ZSZ6KeS55u4562J5Lik55u057q/5bmz6KGM5b6X5YiwQUTiiKVCQ++8jOacrOmAiemhueS4jeWQiOmimOaEjw==
提示2:
4pGh55Sx4oigQkFEPeKIoEJDRO+8jOS4jeiDveWIpOWumuWHuuW5s+ihjO+8jOacrOmAiemhueS4jeWQiOmimOaEjw==
提示3:
4pGi55Sx4oigQUJDPeKIoEFEQ+S4lOKIoDM94oigNO+8jOWIqeeUqOetieW8j+eahOaAp+i0qOS4gOWvueWGhemUmeinkuebuOetie+8jOi/m+iAjOW+l+WIsEFC4oilQ0TvvIzmnKzpgInpobnnrKblkIjpopjmhI8=
提示4:
4pGj55Sx4oigQkFEK+KIoEFCQz0xODDCsO+8jOWIqeeUqOWQjOaXgeWGheinkuS6kuihpeW+l+WIsEFE4oilQkPvvIzmnKzpgInpobnkuI3lkIjpopjmhI/vvI4=
正确答案:Qw==
6Kej77ya4pGg55Sx4oigMT3iiKAy77yM5b6X5YiwQUTiiKVCQ++8jOacrOmAiemhueS4jeWQiOmimOaEj++8m+KRoeeUseKIoEJBRD3iiKBCQ0TvvIzkuI3og73liKTlrprlh7rlubPooYzvvIzmnKzpgInpobnkuI3lkIjpopjmhI/vvJvikaLnlLHiiKBBQkM94oigQURD5LiU4oigMz3iiKA077yM5b6X5Yiw4oigQUJDLeKIoDQ94oigQURDLeKIoDPvvIzljbPiiKBBQkQ94oigQ0RC77yM5b6X5YiwQULiiKVDRO+8jOacrOmAiemhueespuWQiOmimOaEj++8m+KRo+eUseKIoEJBRCviiKBBQkM9MTgwwrDvvIzlvpfliLBBROKIpUJD77yM5pys6YCJ6aG55LiN5ZCI6aKY5oSP77yMPGJyPuWImeespuWQiOmimOaEj+eahOWPquaciTHkuKrvvI48YnI+5pWF6YCJQw==