霾主要出现在近地面低空静风或微风，相对湿度不大的大气形势下。下图为四种地面天气系图，读图完成下列问题。

    We live in computer age (时代). People1 scientists, teachers, writers and even students use computers to do all kinds of work. But more than 30 years ago, 2couldn't do much. They were very big and expensive. Very 3people were interested in them and knew how to use them. Today computers are smaller and 4. But they can do a lot of work, many people like to use them. Some people 5have them at home. Computers become very important because they can work 6than people and make fewer mistakes. Computers can 7people do a lot of work. Writers now use computers to   8. Teachers use them to help teaching. Students use them to   9. Computers can also remember what you   10them. Computers are very useful and helpful. They are our friends. Do you want to have a computer?

I、氯化亚铜（CuCl）是一种白色粉末，不溶于乙醇，微溶于水，易溶于浓盐酸，露置在空气中迅速被氧化成碱式盐．可用于一氧化碳、乙炔等气体含量的测定．以粗铜（含Cu、Fe）为原料可制备纯净的CuCl，其流程如图1：

2015年6月，中国南车与中国北车完成双方合并的换股实施工作。回答下面问题。