2. 外语
  3. The invention of both labor-saving tools and tools of intelligence is rarely accidental. Instead, it is usually the product of h

The invention of both labor-saving tools and tools of intelligence is rarely accidental. Instead, it is usually the product of h

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问题    The invention of both labor-saving tools and tools of intelligence is rarely accidental. Instead, it is usually the product of human need;【C1】______is truly the mother of invention. People usually devise tools to【C2】______for natural deficiencies. For example, people invented weapons to defend【C3】______from physically superior【C4】______But【C5】______is only one incentive(鼓励)for inventions. People also invent【C6】______tools to【C7】______certain established tasks more effectively. For instance, people developed the bow and arrow from the【C8】______spear or javelin(标枪)in order to shoot【C9】______and strike with greater strength.【C10】______civilizations developed, greater work efficiency came to be demanded, and【C11】______tools became more【C12】______A tool would【C13】______a function until it proved【C14】______in meeting human needs, at which point an improvement would be made. One impetus(动力)for invention has always been the【C15】______for speed and high-quality results — provided they are achieved【C16】______reasonable costs. Stone pebbles were sufficient to account for small quantities of possessions,【C17】______they were not efficient enough for performing sophisticated mathematics. However, beads(念珠)arranged systematically evolved into the abacus(算盘). The【C18】______of this tool can be【C19】______to the development of commerce in the East around 3,000 BC and the abacus is known【C20】______by the ancient Babylonian, Egyptian, Chinese, etc.
【C17】
选项 A、but
B、and
C、while
D、thus
答案A
解析 前文讲“卵石可以用来表示一定的财富”，后文讲“它们不能用来解决复杂的数学问题。”可知二者是转折关系，所以选A．but。
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