题干
化学与生活、生产密切相关，下列说法正确的是（ ）
A：牺牲阳极的阴极保护法进行钢铁防腐时,钢铁与电源的负极相连
B：油脂进行皂化反应后，加入食盐分离出高级脂肪酸盐
C：纤维素供给人体能量时，先在体內水解成葡萄糖再被氧化
D：氨气作工业制冷剂时，先汽化再液化
答案(点此获取答案解析）
B
Today is Sunday. There's no school. It is sunny. Charlie and his father are going to the park. Look. Charlie is riding his bike. He is very happy. His father is sitting under a big tree. He is reading a newspaper. In the afternoon, the weather is bad. It is cloudy. Now it is raining. Charlie and his father have no umbrella. They are running home. But they forget their bike.