漫画告诉我们（    ）

①互联网丰富了民主形式                             ②互联网拓宽了民主渠道

③在网上想说什么就说什么，不受限制     ④互联网对保障公民的民主权利发挥着重要作用

实验室有以下几种物质：金刚石、生铁、氧化铝、氢氧化钾、醋酸、酒精．请按要求写出有关物质的化学式．

属于单质的是____；属于碱的是____；属于氧化物的是____；属于酸的是____．

    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.