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

Before the mid-nineteenth century, people in the United State eat 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 State eat 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 1850’s an American named Gail Borden developed a means of condensing and preserving milk. Canned goods and condensed milk became more common during the 1860’s, but supplies remained low because cans had to be made by hand. By 1880, however, inventors had fashioned stamping and soldering machines that mass-produced cans from tin-plate. 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 fanners to raise more produce. Railroad refrigerator car enabled growers and meat packers to ship perishables great distance and to preserve them for longer periods. Thus, by the 1890’s, northern city dwellers could enjoy southern and western strawberries, grapes and tomatoes, previously available for a month at most, for up to six month 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 1870’s, 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 1920’s and 1930’s.
    Almost every one 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 supported by the passage?
选项 A、Tin cans and iceboxes helped to make many foods more widely available.
B、City people demanded home delivery of foods.
C、Most American farmers raised only fruits and vegetables.
D、Commercial ice factories were developed by railway owners.
答案A
解析 可从文中的“By 1880，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 ofthe year．”和后面的“Other trends and inventions had also helped make it possible for Americans tovary their daily diets．”，“In addition，increased use of iceboxes enabled families to store perishables．”推知，即锡罐的使用加大了食品购买的范围。
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