14～16世纪，欧洲出现了一股倡导人文精神的文化运动。产生这种思潮的运动是（    ）

人体摄入过量的铝会对脑、肾等器官造成损害，世界卫生组织奖铝确定为食品污染物．但现实生活中，却“铝禁不止”．下列关于铝的应用不科学的是（    ）

    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.

①使每个选民都有表达自己意愿的机会，选出自己心目中最值得信赖的当家人

②充分考虑当选者结构的合理性

③为选民行使选举权提供了选择的余地

④在被选举人之间形成了相应的竞争