Modern mass-production methods lower the cost of making goods, and thus give us better values. At the same time, American ingenu

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问题     Modern mass-production methods lower the cost of making goods, and thus give us better values. At the same time, American ingenuity and science are constantly at work【B1】______of products. In this way, better quality products at good【B2】______are continually being brought to the people of all【B3】______groups.
    As an example of how this works, when facial tissues were first put on the market in 1924, they were made in【B4】______quantities and sold at 65 cents per box of 200. People liked these facial tissues immediately and began asking for them when they went into different stores. Because there was such a【B5】______for the product, manufacturers began making tissues in larger and larger quantities. Because the makers were making tissues
    【B6】______their production costs were lowered so that the cost of tissues went down. In the meanwhile, the quality of facial tissues was【B7】______improving, because more manufacturers went into the business of making tissues, and each manufacturer【B8】______his product better than his competitor’s. Today,【B9】______65 cents, a box of 200 facial tissues’ costs around one-third of that price, and they are both softer and stronger. When people are free to compete and are free to make more things and make them better — everyone【B10】______.
【B1】

选项

答案improving the quality

解析 分析句子结构可知,本句不缺主要成分,且谓语为复合谓语,并结合空后的介词of可确定本空应填一以“v—ing”开头的,以一名词结尾的词组。improving the quality意为“提高质量”。
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