2016年3月16日上午，十二届全国人大四次会议表决了关于政府工作报告等7个决议草案。根据十二届全国人大四次会议代表审议和全国政协十二届四次会议委员讨论提出的意见和建议，国务院对《政府工作报告》共修改充实61处，“打破地方保护”、“促进房地产市场平稳运行”等写入报告。材料表明

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①人民代表大会制度实行民主集中制原则 

②最高行政机关必须对全国人大和全国政协负责 

③政治协商是科学民主决策的重要环节 

④人大和政协对政府权力构成了有效制衡

舒婷在《人心的法则》中写道：“为一个诺言而信守终生?为一次奉献而忍受寂寞?是的，生命不应当随意挥霍，但人心，有各自的法则。”这段诗句所包含的哲理是（  ）

    Our school is on Guangming Street. It's next to the People's Library. There is a park across from our school. The pay phone is between our school and a post office. Our school is very beautiful. There are many trees and flowers in it. If you want to come to our school from the airport, take a taxi and go down Center Avenue. You can see a big restaurant on your right. There is a bridge near the restaurant. Go across it and turn left. Then go down Bridge Street. Turn left at New Park and go down Guangming Street. Our school is across from a bank.

某同学在松花江畔观察到的下列现象中，属于吸热的物态变化是（   ）