成吉思汗被称为“一代天骄”，他戎马一生，立下赫赫战功。下列内容与成吉思汗有关的是（    ）

①统一蒙古各部     ②建立蒙古政权     ③灭亡南宋     ④定国号为元

    December 25 is Christmas Day(圣诞节). Christmas is an important holiday in many countries. On Christmas Day, most families get together for a big dinner. They give presents to each other and visit friends. The Christmas tree is an important part of the Christmas holiday. Most families buy trees. The families decorate(装饰) the tree together. Parents usually tell their children that Father Christmas comes during the night and brings presents to good children. Of course, Father Christmas isn't real. The parents of the children are really "Father Christmas". They put the presents under the tree or into their children's stocking(长统袜) after the children go to sleep.

细菌繁殖中不可能发生的是

中东地区在亚洲的____ 部和非洲的____ 部。