材料一：下面是某省教育厅公布的该省学生体质状况最新监测结果。（箭头多少代表升降幅度）

材料二：据报道，为在全国亿万青少年学生中广泛开展群众性体育活动，引导学生们到阳光下、到操场上、到大自然中积极参加体育锻炼，成长为共和国的体魄强健、意志坚定、充满活力的建设者，“全国亿万青少年学生阳光体育运动”已全面启动，我省的“千万学生阳光体育运动”也随之启动。

请根据“观察人的口腔上皮细胞”实验，回答下列问题

    Today is Tree- Planting Day. I go to the park with my parents. At about ten o'clock we start to plant trees. We needn't to dig holes because the people in the park dug them before. We just put the young trees into the holes. My father fills the holes with me. My mother carries water for the young trees. We are so tired when we finish the work. All of us hope the trees will grow well. I hope I can plant trees next year.