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  3. Before the mid nineteenth century, people in the United States ate most foods only in season. Drying, smoking, and salting could

Before the mid nineteenth century, people in the United States ate most foods only in season. Drying, smoking, and salting could

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问题     Before the mid nineteenth century, people in the United States ate most foods only in season. Drying, smoking, and salting could preserve meat for a short time, but the availability of fresh meat, like that of fresh milk, was very limited, there was no way to prevent spoilage. But in 1810 a French inventor named Nicolas Appert developed the cooking and sealing process of canning. And in the i850s an American named Gall Borden developed a means of condensing and preserving milk. Canned goods and condensed milk became more common during the 1860s, but supplies remained low because cans had to be made by hand.  By ]880, however, inventors had fashioned stamping and soldering machines that mass produced cans from tinplate. Suddenly all kinds of food could be preserved and bought at all times of the year.
    Other trends,  and inventions had also helped make it possible for Americans to vary their daily diets. Growing urban populations created demand that encouraged fruit and vegetable farmers to raise more produce.  Railroad refrigerator ears enabled growers and meat packers to ship perishables great distances and to preserve them for longer periods. Thus, by the 1890s, northern city dwellers could enjoy southern and western strawberries, grapes, and tomatoes, previously available for a month at most, for up to six months of the year. In addition, increased use of iceboxes enabled families to store perishables. An easy means of producing ice commercially had been invented in the 1870s, and by 1900 the nation had more than two; thousand commercial ice plants, most of which made home deliveries. The icebox became a fixture in most homes and remained so until the mechanized refrigerator replaced it in the 1920s and 1930s.
    Almost everyone now had a more diversified diet. Some people continued to eat mainly foods that were heavy in starches or carbohydrates, and not everyone could afford meat.  Nevertheless,  many families could take advantage of previously unavailable fruits, vegetables, and dairy products to achieve more varied fare.
Which of the following statements is supplied by the passage?
选项 A、Tin cans and iceboxes helped to make many foods more widely available.
B、Commercial ice factories were developed by railroad owners.
C、Most farmers in the United States raised only fruits and vegetables.
D、People who lived in cities demanded home delivery of foods.
答案A
解析 文意推断题。A，有了罐装技术以及冰箱等，更多种类食物就能够在更多的地方买到；B：铁路老板发展厂冰块厂商业；C：美国大部分农民只种植水果和蔬菜；D；住在城里的人需要食物送货上门的服务。由全文内容推断文章所支持的结论，既然是结论就能肯定不是细节，而应是总结性语言，B，C，D选项全是有关细节的陈述。故A正确。
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