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  3. Technological invention has directly or indirectly produced social change in every period of history. The invention of the horse

Technological invention has directly or indirectly produced social change in every period of history. The invention of the horse

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问题     Technological invention has directly or indirectly produced social change in every period of history. The invention of the horse collar in the Middle Ages was a【B1】______technological advance for agriculture; the【B2】______for use at sea so【B3】______navigation in the fifteenth  century that it led in the age of【B4】______; and the steam engine was an【B5】______factor in the industrialization of Europe in the nineteenth century.
    A discovery is another kind of technological【B6】______. While inventions add something  new to a culture, discoveries increase our knowledge of something that already exists. Gravity had always been there, but Newton "discovered" it: be【B7】______how this natural force worked and how its laws【B8】______to falling bodies. This knowledge made possible many new inventions.【B9】______.
    Since each invention makes more inventions possible, the speed of technological development tends to accelerate.  Benjamin Franklin experimented with electricity in the eighteenth century,【B10】______. In the hundred years since Edison invented the light bulb, the discovery  of electricity has led to tens of thousands of inventions, from the internal burning engine to the computer.【B11】______pose some of tile greatest challenges of our time.
【B3】
选项
答案improved
解析 谓语动词，与空格相关的句意为：海上指南针的使用______十五世纪的航海。此句与其他两句并列，都是对首句的阐述，也是讲技术发明的影响。由此可推知，此处为“改善，提高”的意思。
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大学英语四级

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