光华初中开展“法制宣传日”活动，特邀人民法院少年庭的法官做“遵守宪法法律预防违法犯罪”的知识讲座。这体现了对未成年人的（　）

在t℃时，将少量生石灰加入到一定量的饱和石灰水中，搅拌，静置后恢复到t℃时，下列说法正确的是(  )

    It is March 12th. It's Tree Planting Day. There are many people on the hills. They're planting trees. People plant many trees today. Plants are important to us. They can make food from the air, water and sunlight. But animals and people can't do so. Animals and people can get food from plants. Without plants, life will not go on, Plants make the air clean. They can keep water from flowing away(流失). They can stop wind from blowing up sand and earth. But in some places people are cutting down too many trees. This brings about floods and sandstorm. Now more and more people know that plants are important. They will plant more trees and grow more plants. They will try to protect the trees.