根据首字母提示，补全短文 

    Have you e  ____  planted a few trees on Tree Planting Day?
    Each year, many of people, both old a ____  young, plant a lot of trees. But this may not be the best w____ to make your home a greener place. Last week, we v ____ a park in Hebei. We were s ____ to find most of the trees had been burnt. The workers told us that the trees d ____ soon after they were planted because they were not watered well enough. So the workers burnt them and changed the trees for new trees to be planted this year. On a card found in one of the trees, a student w ____  . “I hope this tree will g ____ up with me to become the backbone(栋梁) of our country.” The workers said that the survival of the trees was really more important t ____  how many trees were planted.
    Some people in Beijing now have a new idea that they can donate some m ____   and let professionals plant and take care of trees.

在一节化学复习课上，同学们整理了铁、盐酸、二氧化碳、氢氧化钙、硫酸铜五种物质之间的反应关系，并构建了知识网络．请回答下列问题．

细菌和真菌的生存也需一定的条件，如____ 、适宜的温度、____ 。

如下图所示，将足量的某铁粉用水均匀地粘在试管内壁上，将试管倒立在装有水的烧杯中。实验过程中，观察到试管内液面缓慢上升。下列分析错误的是