如图为一氧化碳还原氧化铜的装置图：

（1）图中A处的实验现象是 ____，B处的实验现象是____．

（2）A处反应的化学方程式为 ____,　 B处反应的化学方程式为  ____.

（3）该装置存在的主要问题是____，改进的具体措施是____．

    Ben was hoping for a video game for his birthday. He also wanted a board game. And he wanted some CDs too.

    He got the board game and some CDs, but what was in the last package (包裹)? It was from his sister. He slowly opened the package. It didn't feel like a video game.

    It was a purple sweater. Purple was Ben's least favourite colour. He smiled and thanked his sister nicely, but he didn't want to wear that sweater. He couldn't wear purple!

    He quickly put the sweater away in his room. Then he ran off to play the new board game with his family.

    The next day, Ben's mother asked him about the sweater.

    "Why don't you wear your purple sweater today?" she said. "Your sister made it just for you!"

     "I am not cold," Ben said without thinking. In fact, he was lying. He shivered (发抖) all day.

    Then one day they were going out to dinner as a family. Ben's mother asked him to wear the sweater again. "I don't want to wear it. I hate (讨厌) purple," he said.

    "Ben," said his mother, "I know it's not the nicest sweater in the world, but think about how important Karen is to you. You know she will be very happy if you wear it to dinner."

    Ben walked slowly to his room. He knew his mother was right. He wore the sweater to the restaurant. His sister smiled all night.

青海湖形成初期，通过倒淌河与黄河水系相通，后逐渐演变为咸水湖；现平均深度18米。青海湖流域夏季风力最小，表层水温平均为16℃，底层水温平均为9.5℃；秋季风力开始逐渐增大，水温分层现象逐渐消失。图3示意青海湖地理位置。据此完成以下问题。

    Lots of women don't have breakfast and they have a lot of different excuses for that. Some say they don't have time, some think they're losing weight, and others just don't like breakfast.
    But the fact is that eating in the morning is very important, especially when you're trying to lose weight. Eating just about anything from 300 to 400 calories would be better than nothing at all. If your pizza is added with vegetables, that'll be better.
    Breakfast is one kind of meal that one should never miss; even one is trying to lose weight.
    Research shows that eating breakfast keeps you from eating too much later in the day. Researchers at the University of Southern California found that those who don't have breakfast have a bigger chance of getting fat than those who have a morning meal every day.
    So if you want to lose weight, you should eat something in the morning. Anything is OK. Having only coffee or orange juice or having no breakfast does harm to your health.
    I have a good idea here. I sometimes eat last night's leftovers for breakfast. It may sound crazy, but it really works for me! I find if I tell myself, “You can eat them tomorrow.” I will put away the leftovers instead of eating more that night. Try it yourself. You may save some pre-bedtime calories. Keep it and see how healthy you will be!