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

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【B1】______at work【B2】______the quality of products. In this way, better quality products at good 【B3】______are continually being brought to the people of all【B4】______groups.
    As an example of how this works, when facial tissues were first put on the market in 1924, they were made in【B5】______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【B6】______for the product,【B7】______began making tissues in larger and larger quantities. Because the makers were making tissues in great quantities, their production costs were【B8】______so that the cost of tissues went down. In the meanwhile,【B9】______, and each manufacturer strove to make his product better than his competitor’s. Today, instead of costing 65 cents,【B10】______.【B11】______— everyone benefits.
【B2】
选项
答案improving
解析 空前的are和空后的the quality表明，本空应填一动词的现在分词。
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大学英语四级

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