题目

某班同学做验证铁、铜、银的金属活动性顺序的实验，用到的药品有铁丝、铜丝、银丝、稀硫酸和硫酸铜溶液．实验结束后，化学兴趣小组的同学欲对该实验的废液进行探究，请你一起参与． 【提出问题】废液中含有什么物质？ （1） 【交流表达】小明通过观察，认为废液中一定含有硫酸铜．他观察到的现象是． （2） 小红通过分析，认为废液中一定含有硫酸亚铁，她的依据是：． （3） 【作出猜想】小华认为废液中还可能含有硫Linda and Betty were both twenty years old. They studied in the same medical college. In June, after a school year was over, they decided to take a vacation in the country. They went to several towns and villages, and visited some places of interest, saw and heard a lot of interesting things. They enjoyed themselves very much. One afternoon, they were going to stay overnight in a small town. It was too hot to go further and they wished they could find a river and swim in the cool water. They were driving the car slowly while they were looking around. Suddenly Linda saw a lake not far away. They drove there fast and stopped the car by the lake. They looked around and found a man was sitting on a stone and fishing there. When they took their clothes and were going to jump into the water, the man came up to them and shouted," Sorry, Madams' swimming is not allowed (允许)in the lake!""Why didn't you tell us about it before we took off our clothes?" Betty said angrily. "But it isn’t forbidden to take off clothes by the lake," said the man.【小题1】Linda and Betty were       .A．classmatesB．sistersC．doctorsD．nurses【小题2】The man didn’t want them      .A．to fish in the lakeB．to swim in the lakeC．to take off their clothedD．to get angry【小题3】The word "forbidden" means_____.A．支持B．禁止C．同意D．干扰