题目

I was standing in the checkout line behind a woman in her 60s. When it was her turn to pay, the cashier(收银员)greeted her by name and asked her how she was doing. The woman shook her head and said: “Not so good, My husband just lost his job.” Then she gave the cashier food stamps(食品券). My heart ached . I wanted to help but didn’t know how. At the parking lot, I spotted the woman. I remembered something in my purse that might help her. It wasn’t some money or an offer of a job for her husband, but maybe it would make hr life better. “Excuse me,” I said, “I overhea把冰水混合物拿到温度在零摄氏度以下的房间里，在冰不断增加的过程中，冰水混合物的温度（　　）A．保持不变B．降低C．升高D．无法确定