用适当的代词填空。
Her parents are ____ workers. Her classmates are ____ from peasants' families.
下列中国古代朝代顺序排列正确的一项是（ ）
A smile nothing, but gives much.
“西边的太阳就要落山了，鬼子的末日就要来到。弹起我心爱的土琵琶，唱起那动人的歌谣。”这首脍炙人口的《铁道游击队》主题曲反映的时代背景是
