A：在测定空气中氧气含量的实验中，红磷可以用木炭代替
B：合金的熔点要比组成它的纯金属的熔点低
C：电解水生成氢气和氧气，说明水是由氢气和氧气组成的
D：一氧化碳还原氧化铜时，先加热氧化铜粉末至红热，后通入一氧化碳气体
I am Bill Jones. I am a teacher of English. My wife is Linda Jones. She is a nurse. We have a daughter and a son. We have many friends.Look! These are my friends. This is Mr. Black. He is a worker. He works in a shoe factory He makes shoes there. That’s Mrs. Black. She is a worker on a farm near here. The girl is their daughter. She is a student. She is thirteen. The boy is their son. He is a young soldier（战士）. His name is Carl Black.
①村民不顾禁令，焚烧秸秆，同学们调研后给政府提建议，应大力兴建秸秆发电厂
②组织学生到平遥古城、乔家大院等地参观，请同学当讲解员，并拍成视频，供教学使用
③校园有农业试验田，学校定期组织学生劳动，不少学生因此成为农业小专家，对生物等学科产生浓厚兴趣
④在全校倡导垃圾分类，不用一次性筷子，少用塑料袋，举行我爱用手帕等活动
我国是严重缺水国家，合理利用和保护水资源是每个公民的责任．请你结合生活和生产实际，提出合理利用和保护水资源的具体措施（要求写出两条）．
