2. 外语
  3. Immediately after the Civil War, however, the diet began【C1】______ . Rail transportation increased the supply and【C2】______ the

Immediately after the Civil War, however, the diet began【C1】______ . Rail transportation increased the supply and【C2】______ the

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问题      Immediately after the Civil War, however, the diet began【C1】______ . Rail transportation increased the supply and【C2】______ the quality of the milk that reached urban centers;【C3】______ storage and refrigerator cars made【C4】 ______the【C5】______ consumption of fresh vegetables, fresh fruits, and fresh【C6】______ ; and commercial canning【C7】 ______the【C8】______ of appetizing and healthful foods. Subsequently food statistics indicated an increased consumption of 【C9】______ products, fresh fruit, fresh vegetables, sugar and syrups, coffee, tea, cocoa, and spices. Decreased consumption was shown【C10】______ meats, potatoes, and grain products.【C11】______By and large, the American diet continued to reflect a considerable reliance upon animal products,【C12】______ on grains, which meant that a【C13】______ large acreage was required to feed the American public. Whereas a grain and fish diet, such as in Japan, requires only a quarter of an acre high; yield cropland and no pasture per capitates. American diet requires about two and a half acres of cropland and ten acres of pasture per capita. Also it indicated a 【C14】______ toward the【C15】______ protective foods, toward those high【C16】______ vitamins and proteins. This change was greatly furthered by governmental food inspection(the Pure Food and Drug【C17】______ was passed in 1906), by the increasing use of【C18】______ refrigerators in the 1920’s and 1930’ s and of freezers for frozen food during recent【C19】______ .
     In the years after World War I a food revolution【C20】______ that was reminiscent of the one that occurred after the Civil War. The output of the food; manufacturing industry quadrupled from 1900 to 1940. In that interval, as we have mentioned earlier, home canning gave way to commercial canning, and the labor of housekeeping was lightened.
【C7】
选项 A、expand
B、extend
C、explore
D、exploit
答案B
解析 extend 最符合题意。表示延伸
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