两次鸦片战争本质上相似之处是（    ）

A、B、C是三种常见的含钙化合物．它们之间有如图所示的转化关系（部分产物略去）：

（1）A物质的化学式是____ ，B物质的俗称是____ .

（2）举出B物质在农业生产中的一种用途：____．

（3）反应③的化学方程式为　____ ，该反应的基本反应类型是____ ．

    These days, few 11-year-olds are allowed to walk to school by themselves. However, 11-year-old Rosalie Atkins is traveling the world alone.

    Rosalie Atkins lives in England. Her parents decided to let her travel alone. This summer Rosalie's mother put her on a plane to Paris with a host family.

    Rosalie spent a week visiting Paris. She visited the Eiffel Tower and Notre-Dame, as well as several museums, markets, and parks. “If I had visited with my parents, we would have seen only the touristy parts of Paris,” said Rosalie. “But because I was staying with a French family I saw more.” Traveling to different countries, Rosalie also expressed the confidence. “I am quite confident when I have to talk to new people, which is a useful social skill, ” Rosalie said.

    Rosalie is glad that her parents allow her to go on adventure() that other kids could only dream of. Rosalie said, “Your parents aren't going to travel with you forever. You have to learn to be independent some day, and in my opinion the sooner the better.”