Modern Chinese use the solar calendar（阳历）as English people do . But at the same time, they use their own lunar calendar. Each lunar year is given the name of one of these animals : the rat , the ox , the tiger , the hare , the dragon , the snake , the horse , the goat , the monkey , the chicken , the dog and the pig . This list lasts for 12 years and then starts again.

     Each Chinese month starts on the day of the new moon. And the full moon comes on the 15th day of the month. The New Year always starts between January 21 and February 20. On the last day of the lunar year, there is a big family dinner. All members of the family except married daughters try to be present at this meal, even of they have to travel many miles to reach the home of their parents. Old quarrels are forgotten, and everybody is happy. After the dinner, the children keep awake to welcome the New Year.

    The New Year celebrations last for 15 days, from the new moon to the full moon. On the first day, children and unmarried people go to visit their elder

①凝聚和动员民族力量、展示民族形象

②有利于搞好经济建设，增强综合国力

③弘扬和培育民族精神是我国当前的中心任务

④民族精神是综合国力的基础，是综合国力的最重要因素

下列变化属于化学变化的是（　　）

____ C₂H₂+____O₂ $\underset{\_}{\underset{\_}{点燃}}$ ____CO₂+____H₂O

____ Fe₂O₃+____CO $\underset{\_}{\underset{\_}{高温}}$ ____CO₂+____Fe．