题目

The increasing environmental problems and need for eco-friendly products and services are creating a new job section of green-collar jobs. 【1】 It is expected that by 2025 about 25% of the jobs in developed countries will be of green-collar jobs. Doesn’t the data look promising for the future?【2】 And jobs will pop up at every income level, from environmental manager to gardener. For example, many countries including the United States have understood that fossil fuels have negative effect on the environment which can later become a serious danger to mankind. 【3】 The increasing dema同学们在学习酸碱的化学性质时构建了如图知识网络，A、B、C、D是不同类别的无机化合物，“－”表示物质在一定条件下可以发生化学反应。请回答下列问题：(1)反应①的化学方程式为____________________________________________________；反应的实验现象有___________________________________________。(2)物质C应是酸、碱、盐中的哪类物质？________。(3)写出图中一个中和反应的化学方程式________________________________________。