Kate wants some milk. Could you give____to____?

化学兴趣小组的同学用家中的物品来探究酸的性质，这些物品有：食用醋精、食品干燥剂、鸡蛋壳、牵牛花瓣、生锈铁钉、纯碱、pH试纸（带比色卡）、筷子．

【查阅资料】

（1）食用醋精中含有10%﹣15%的醋酸，呈无色；食品干燥剂主要成分是氧化钙；鸡蛋壳主要成分是碳酸钙

（2）牵牛花汁液在酸性溶液中显红色，在中性溶液中显紫色，在碱性溶液中显蓝色

(单位：cm)

As we know, Chongqing has changed a lot. Most of the people feel much safer now. More and more trees are being planted in the city. And every day you can see many old people play sports everywhere. The change makes the people in the city live a happy life. The small survey below is from the people who live in Chongqing. One hundred persons were chosen to answer the questions last week.