利用枯草杆菌生产分泌性中性蛋白酶，以下符合该酶分离纯化的正确流程是

①制成酶制剂　　②发酵液过滤　　③冷冻干燥　　④层析法提纯蛋白酶

青岛38元一只的“天价虾”、哈尔滨398元一斤的“天价鱼”等“宰客”行为曝光后，有关部门依法进行了严厉查处，并将结果公之于众，这样做（　　）

①将会打击生产经营者的积极性，损害城市、政府形象

②能够推动诚信社会建议，培育和践行社会主义核心价值观

③可以创造良好的消费环境，维护消费者的合法权益

④有利于推动法治社会建设，落实依法治国方略

    Jane was an old woman. She was rich and lived in a big house. One sunny morning, Jane opened the window and looked at her garden. The sun was shining brightly. "What a good day!" She said. Suddenly she saw a man eating grass in the front garden of her house. She walked to the man and asked, "Why are you eating grass? Are you very hungry?" The man answered, "I have no money to buy any food. I haven't had meals for days. I'm dying of hunger." "Poor boy," said Jane, "come to the back door." Then she walked into the house again. "The rich lady will give me some food to eat. It's so kind of her." The man thought. But when he went into the house, Jane opened the back door and said to him, "The grass is taller behind the house."

有“华南第一湖”美称的青狮潭，风光秀丽，气候宜人，2010年6月第一周每天的最高气温（单位：℃）分别是：23，24，23，24，x，25，25，这周的平均最高气温为24℃，则这组数据的众数是（ ）

为了确定Na₂CO₃和NaHCO₃混合物样品的组成，称取四份该样品溶于水后分别滴加相同浓度盐酸30.0mL，充分反应，产生CO₂的体积（已折算成标准状况下的体积，不考虑CO₂在水中的溶解）如表．