题目

My grandma whom we all called Nanny was a solid, first­generation, Italian immigrant. She came to this country with her family on a tiny ship during World War I when she was only 8 years old. During the trip she survived stormy seas, little food, and an attack by a German U­boat. After getting here, her large family worked hard to build a new life in America. They never had much money but were rich in love. One day, when I was about 5 or 6 years old, my parents and brothers went on a trip. It was just me and Nanny in the house for the weekend. Nanny seemed so happy to be taking care o有氧呼吸中产生二氧化碳的阶段、氧气利用的阶段、水参与反应的阶段、有水生成的阶段分别是(     )①第一阶段　②第二阶段　③第三阶段A．②③②③B．①③②③C．②③①②D．③②②③