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 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 massproduced 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 population created demand that encouraged fruit and vegetable farmers to raise more produce. Railroad refrigerator cars enabled growers and meat packers to ship perishables great distances 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 months of the year.
The author implies that in the 1920’s and 1930’s home deliveries of ice _________ .
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Lời giải:
Báo saiGiải thích: Thông tin nằm ở: “The icebox became a fixture in most homes and remained so until the mechanized refrigerator replaced it in the 1920’s and 1930’s.” – Thùng băng trở thành một vật dụng gia đình phổ biến và duy trì cho đến khi tủ lạnh thay thế nó vào những năm 1920 và 1930.
Dịch nghĩa: Tác giả chỉ ra rằng vào những năm 1920 và 1930, vận chyển băng tận nhà ____
A. Tăng giá
B. Chỉ diễn ra vào mùa hè
C. Giảm số lượng
D. Có một lịch trình không đồng đều