题目

阅读理解Teenagers shouldn’t eat too much junk food.Teenagers shouldn’t eat food with too much salt. Salt can cause high blood pressure in the future. Teenagers should eat food with less fat, oil and sugar.Teenagers need to eat some fruits and vegetables every day. Fruits and vegetates are rich in vitamins and have little fat. Teenagers need to drink more milk. Milk will help their bones grow.Teenagers need to eat breakfast every day. This is good for their bodies and minds.1. According to the doctors’ advice, what does junk food include?A. Milk and vitamins.             测定0.1 mol·L-1 Na2SO3溶液先升温再降温过程中的pH，数据如下。时刻①②③④温度/℃25304025pH9.669.529.379.25实验过程中，取①④时刻的溶液，加入盐酸酸化的BaCl2溶液做对比实验，④产生白色沉淀多。下列说法不正确的是A. Na2SO3溶液中存在水解平衡：+H2O+OHB. ④的pH与①不同，是由于浓度减小造成的C. ①→③的过程中，温度和浓度对水解平衡移动方向的影响一致D. ①与④的Kw值相等