如图，已知长方形ABCD，R，P分别是DC，BC上的点，E，F分别是AP，RP的中点，当点P在BC上从点B向点C移动，而点R不动时，那么下列结论成立的是（　　）

短文填空

     Have you ever tasted or perhaps heard of sugar painting? As fewer people choose to make this kind of painting, the traditional Chinese folk craft might have become a ____(distance)memory in some ways.____, a 38-year old craftsman, Li Jianzhong, is committed to____(keep)the art of sugar painting alive.

     Li worked as a miner for more than ten years. After ____mine closed down, Li turned to housing decoration, until he ____(force) to give that up due to a finger injury. Earlier this year, he discovered sugar painting, something he really had an interest in and a strong desire to learn.

     Since there was no sugar painting craftsman in his village, he studied by ____(he) through large quantities of videos and information on the internet. Li loved painting when he was young, and he found it easy____(learn) the skill in sugar painting. He soon mastered the skill and could make a ____(vary) of sugar paintings. A sugar painting is made with melted brown or white sugar. Craftsmen ____(normal) paint animals and flowers on a stone board with the syrup(糖浆). When the sugar cools down, ____appears is a piece of sugar art.

我们的祖先很早就掌握了用孔雀石主要成分是Cu₂（OH）₂CO₃和木炭一起加热进行火法炼铜的工艺，早在3000多年前的商朝就造出“后母戊鼎”等许多精美的青铜器．

有关的化学方程式：①Cu₂（OH）₂CO₃2CuO+H₂O+CO₂↑；②C+2CuO2Cu+CO₂↑．

在西汉时期就开始湿法炼铜的应用，当时刘安所著的《淮南万毕术》中，就有曾青（硫酸铜溶液）得铁则化为铜的记载，请回答下列问题：

（1）上述反应①属于分____反应（选填“分解”、“化合”或“置换”）．

（2）青铜属于____（填“氧化物”、“单质”、“化合物”或“混合物”）．

（3）写出湿法炼铜发生反应的化学方程式：____ ．

（4）以“绿色化学”的观点，对照火法炼铜，谈谈湿法炼铜的优点：____．