向盛有硫酸铜水溶液的试管里加入氨水，首先形成难溶物，继续添加氨水，难溶物溶解得到
题型：选择题
问题：
向盛有硫酸铜水溶液的试管里加入氨水，首先形成难溶物，继续添加氨水，难溶物溶解得到深蓝色的透明溶液。下列对此现象说法正确的是（ ）
A．反应后溶液中不存在任何沉淀，所以反应前后Cu2+的浓度不变
B．沉淀溶解后，生成的深蓝色配合离子[Cu(NH3)4]2+一定难电离
C．向反应后的溶液中加入过量盐酸，无任何现象发生
D．在[Cu(NH3)4]2+离子中，既存在离子键，又存在共价键
题型：选择题
Bill Gates is head of the software company Microsoft and one of the world’s richest men. He was born on October 28, 1955 and grew up in Seattle with his two sisters. He was a very bright boy. Science and math were his two favorite subjects at school. And he dreamed of being a scientist.
Bill first started to play on computers at the age of 13. At that time, a computer was a very large machine. Once he was interested in a very old computer. He and some of his friends spent as much time as possible on computers. In the end, they worked out a software program. Bill sold it for 4,200 dollars when he was only 17.
In 1973, Bill went to Harvard University. In 1975, Bill and his partners developed a software program called BASIC. This was not the first program ever created, but its inventors were the first to decide that people who wanted to use it should pay for it. BASIC was a success. Then Bill left Harvard to work for Microsoft, a company he started in 1975 with his boyhood friend Paul Allen. They thought the computer would come into every office and every home soon. So they began developing software for personal computers. They improved the software to make it easier for people to use computers. After many years of hard work, Microsoft becomes one of the most successful companies. And Bill Gates also becomes one of the richest businessmen in the world.
根据文章内容将信息卡补充完整。
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