Ice cream became popular in France in the 1500s, but only among royalty. Over the next few centuries, the process of making them

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问题     Ice cream became popular in France in the 1500s, but only among royalty. Over the next few centuries, the process of making them【C1】______from hauling mountain ice to salt / ice freezing methods. Cream was introduced as a (an) 【C2】______, and by the 1700s, people were enjoying a dessert that was very【C3】______to today’s ice cream.
    The hand-cranked ice cream freezer was first developed by Nancy Johnson in 1846. Ice was readily【C4】______from large warehouses in that era, so ice cream became a【C5】______that could be enjoyed by almost anyone, not just the rich. Ice cream making was revolutionized again in 1851, when Jacob Fussel started the first wholesale ice cream manufacturing【C6】______in Baltimore, Maryland. The business slowly evolved for the next few【C7】______Manufacturing methods improved, 【C8】______refrigeration technology became cheaper and more【C9】______. By the 1920s, home refrigerators became more common, which gave the ice cream industry another【C10】______. Sugar was rationed in the U. S. during World War I, but the ice cream industry【C11】______the government that ice cream was a (an)【C12】______food. Ice cream factories were allotted (分配) sugar rations and production continued. Ice cream increased in【C13】______until the Depression years caused a drop in sales for【C14】______all non-essential goods. Sales increased in the years leading up to World War II before【C15】______off in the post-war years. The rise of the giant supermarket created demand for cheaper, mass-produced ice cream, but quality【C16】______. Later, the 1960s【C17】______a resurgence in high quality ice cream.
    Now ice cream still【C18】______up about 60 percent of the market【C19】______among frozen desserts. While ice cream is【C20】______worldwide, it has become an American tradition.
【C8】

选项 A、but
B、while
C、yet
D、although

答案B

解析 连接词辨义题。本句意为“随着制冷技术变得更便宜,制造冰淇淋的方法得到了改良”,两者之间有因果关系,while“当……时候”,符合题意。but“然而”;yet“然而”;although“虽然,尽管”,均表示转折,故排除。
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