下列对化学实验现象的解释或结论正确的是
| 选项 | 事实 | 解释或结论 |
| A | 常温下，向饱和Na2CO3溶液中加入少量BaSO4粉末，过滤，向洗净的沉淀中加稀盐酸，产生气泡 | 常温下： Ksp(BaCO3)>Ksp(BaSO4) |
| B | 盐酸与亚硫酸钠反应，生成使品红试液褪色的气体 | 非金属性：Cl> S |
| C | 滴有酚酞的NaHCO3溶液呈浅红色，微热后红色加深 | NaHCO3分解生成了Na2CO3，碱性增强 |
| D | 光束通过Al(OH)3胶体时会发生丁达尔效应 | 胶体粒子的直径为1nm~100 nm |
答案：D
题目分析：A、这和溶度积大小没关系，只所以硫酸钡转化成了碳酸钡，是因为溶液中的碳酸根离子的浓度达到了与钡离子沉淀的数值，错误；B、盐酸不是含氧酸，错误；C、变红是因为加热促进了水解，使碱性增强而已，错误；D、正确。
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| This is Part Three in our 1 about family life. We invited two students Josh Franklin and Alice Gomez, 2 their weekend chores. They told us about the chores they did last weekend. On Saturday morning, Josh had two big chores 3 . He didn't like washing the clothes, but he enjoyed 4 the garage (车库). "I listened to the radio and sang my favourite songs 5 . I worked," he said. Alice 6 go to the store and buy food for the family on Saturday morning. Her mother usually goes with her, 7 his time she went alone. "I like shopping for food. I bought things I like to eat and my parents 8 them. " Josh and Alice 9 liked helping with their parents' yard sales. "I like talking to all the people,"said Josh. Alice said,"My parents gave me part of the 10 . Now I can buy anything I want. " | ||||
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