题目

I’m not the kind of mother who often brushes her daughter’s hair, and my daughter has never liked sitting quietly long enough for me to do it.But today, I took a chair outside and let my daughter Kitty sit on it. She was sitting high with her eyes closed, skin still wet from the shower and her messy hair behind her back. I realized she was taking in every touch from my hands. Today we would send Kitty away for a week of a summer camp. This was all my idea.She's nearly 12, and I notice that I'm with my child nearly 24 hours a day. Living on the farm without neighbors, Kitty has become incre下列过程中，发生了化学变化的是A．石油分离出汽油、柴油 B．利用金刚石裁玻璃C．利用干冰进行人工降雨 D．煤转化为煤气