根据句子意思填写正确的月份AB C DE (1) New Year's Dayis in . (2) The Easter partyis in . (3) Tree PlantingDay is in . (4) Children's Dayis in . (5) Mother's Day isin . 答案:【1】C January
【1】A April
【1】B March
【1】E June
【1】D May选修4-1:几何证明选讲 (本小题满分10分) AB是圆O的直径,D为圆O上一点,过D作圆O的切线交AB延长线于点C,若DA=DC,求证:AB=2BC。