题目

Please help!Ladies and gentlemen, thank you very much for coming to this concert. I hope you have enjoyed the music. The purpose of this concert is to _____ money for children in Africa. Every day ____ children in Africa die because they have diseases or have not enough _____. There are two main reasons. First, there are no jobs for the children's parents, so they have no money to buy food or ____. Second, the governments in many African countries do not have the money to take care of poor people.Most African countries are poor. The land is not good for _____ food and the weather is also bad f洒水汽车在水平路面上匀速行驶并向路面洒水的过程中，其机械能的变化是（ ）A．减小B．保持不变C．增大D．先减小后增大