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  3. According to myth, Rwanda’s ancient line of kings descended from a man with secret knowledge: He could【B1】______ordinary rock in

According to myth, Rwanda’s ancient line of kings descended from a man with secret knowledge: He could【B1】______ordinary rock in

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问题     According to myth, Rwanda’s ancient line of kings descended from a man with secret knowledge: He could【B1】______ordinary rock into smooth, gleaming iron.【B2】______this new technology, he taught his people to make hard, durable weapons for defeating their enemies and sharp axes for cutting the forest to make fields. By the time the first Europeans arrived in the 19th century, iron had become【B3】______in the kingdom of Rwanda
    Other traditional African societies tell stories of【B4】______ironworkers who descended from heaven or came from other lands. The prevalence of such legends【B5】______the importance of ironworking in these cultures, and archaeologists have long wondered if the arrival of iron metallurgy【B6】______the growth of complex early societies. Did foreigners【B7】______bring ironworking to Africa, or did Africans invent it themselves?
    Entering the Iron Age was not easy. Metalworkers had to melt ore at【B8】______temperatures and then repeatedly hammer and reheat the spongy metal. The traditional view is that metallurgists in Turkey were the first to melt iron ore【B9】______, beginning around 1800 B.C.E. Initially, they【B10】______the new metal for precious【B11】______or ritual objects. But by 1200 B.C.E., workers in the Levant were boiling out【B12】______amounts of iron.
    The metal had a major【B13】______on societies. Iron was a transformative metal. Iron ores are much more【B14】______than copper or the tin needed to make bronze. Bronze was【B15】______costly and largely limited【B16】______use in ritual objects and goods for【B17】______. But once cultures learned to melt iron, they could put iron tools into the hands of【B18】______people for clearing forests and tilling the【B19】______. This boosted agricultural yields, increased the numbers of villages, and【B20】______ever more social complexity.
【B5】
选项 A、influences
B、underlines
C、endangers
D、accelerates
答案B
解析 句子的主语是The prevalence of such legends(关于铁匠的传说的广泛流传)，宾语是the impor-tance of ironworking(铸铁的重要性)，可见这里缺少了“表明，加强，强调，突出”等意义的动词作谓语。underline意为“强调，表明……的重要性，加强”，完全符合句意。
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