题干

下面是某化学活动小组在研究性学习中探索葡萄糖分子的组成和结构时设计并完成的一组实验:将下列四种液体分别取2 mL先后加到2 mL的新制Cu(OH)2中,充分振荡。实验现象记录如表:

液体

葡萄糖溶液

乙醇

甘油(丙三醇)

水

实验现象

氢氧化铜溶解,溶液呈蓝色

氢氧化铜不溶,混合物蓝色变浅

氢氧化铜溶解,溶液呈蓝色

氢氧化铜不溶,混合物蓝色变浅

根据上述实验及现象能够得出的正确结论是(    )

A:葡萄糖分子中可能含有醛基

B:葡萄糖分子中可能含有多个羟基

C:葡萄糖的分子式为C6H12O6

D:葡萄糖分子碳链呈锯齿形

上一题 下一题 0.0难度 选择题 更新时间:2019-11-15 06:51:18

答案(点此获取答案解析)

B

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  What Theresa Loe is doing proves that a large farm isn't prerequisite for a modern grow-your-own lifestyle. On a mere 1/10 of an acre in Los Angeles, Loe and her family grow, can(装罐)and preserve much of the food they consume.

        Loe is a master food preserver, gardener and canning expert. She also operates a website, where she shares her tips and recipes, with the goal of demonstrating that every has the ability to control what's on their plate.
       Loe initially went to school to become an engineer, but she quickly learned that her enthusiasm was mainly about growing and preparing her own food. “I got into cooking my own food and started growing my own herbs (香草) and foods for that fresh flavor,”she said. Engineer by day, Loe learned cooking at night school. She ultimately purchased a small piece of land with her husband and began growing their own foods.
     “I teach people how to live farm-fresh without a farm,” Loe said. Through her website Loe emphasizes that “anybody can do this anywhere.” Got an apartment with a balcony (阳台)? Plant some herbs. A window? Perfect spot for growing. Start with herbs, she recommends, because “they're very forgiving.” Just a little of the herbs “can take your regular cooking to a whole new level,” she added.“I think it's a great place to start.” “Then? Try growing something from a seed, she said, like a tomato or some tea.”
       Canning is a natural extension of the planting she does. With every planted food. Loe noted, there's a moment when it’s bursting with its absolute peak flavor. “I try and keep it in a time capsule in a canning jar,” Loe said. “Canning for me is about knowing what's in your food, knowing where it comes from.”
        In addition to being more in touch with the food she's eating, another joy comes from passing this knowledge and this desire for good food to her children: “Influencing them and telling them your opinion on not only being careful what we eat but understanding the bigger picture,” she said, “that if we don't take care of the earth, no will.”