古代时，由于无法解释日食成因，人们迷信地认为日食是-种凶兆．现在我们可以用光的 ____来解释日食的成因，如图所示。有乒乓球、足球和瓦数较大的白炽电灯，请你用这三种物品代表相应的星球，设计出观察日食成因的实验，并根据三个星球排列的位置，按示例，把答案填写在横线上。
用 ____代表 ____；用 ____代表 ____。

    Mrs. Green works very long hours every day. She usually gets up(起床 ) at 5:40. She brushes her teeth(刷牙) and goes to her workplace (工作地点). Then she runs with some kids. After that she takes a shower(淋浴). she eats her breakfast at 7:00. Her work starts(开始) at 8:10. she is good at(擅长 ) history and many boys and girls learn history from her. All the kids（孩子） like her very much. She often talks or plays games with the kids. She  usually goes to bed(睡觉) after 22:00. she is often very tired(劳累) but she likes her job and loves the kids. She doesn't work on weekends. Mrs. Green likes reading at home on weekends(周末). Sometimes some kids' parents come to her home to talk about their kids. When Monday comes, Mrs. Green gets busy again.

端午节吃粽子，会闻到粽子的清香，这是一种____现象，两块表面干净的铅互相压紧能够吊住重物，说明分子间存在____．

读下面两幅图,针对图中反映问题，其有效措施有 （    ）

①调整计划生育政策，促进人口均衡发展

②完善劳动合同制度，构建和谐劳动关系

③实行延迟退休政策，缓解社会养老压力

④提高职工工资水平，调动劳动者积极性