2. 外语
  3. Several of the chemical elements were known in prehistoric【C1】______ . One of the great【C2】______ forward in civilization came w

Several of the chemical elements were known in prehistoric【C1】______ . One of the great【C2】______ forward in civilization came w

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问题     Several of the chemical elements were known in prehistoric【C1】______ . One of the great【C2】______ forward in civilization came when bronze, an alloy,【C3】______ stone as the main material for tools and weapons. The iron replaced bronze. The first elements【C4】______ were those that were found free in nature or could be readily【C5】______ from their ores at relatively low temperatures. During the Middle Ages, chemistry was mostly practised by the alchemists,【C6】______ tried to turn base metals into gold, and who were interested in discovering a way of living for【C7】______ . But they discovered many important【C8】______ about the metals and some of the most easily attainable compounds. Even before the Middle Ages, people knew how to【C9】______ mercury, tin, and iron from their ores. By the time of Paracelsus, chemistry was developed largely to the effort of【C10】______ medicines.
【C9】
选项 A、absorb
B、extract
C、allude
D、devour
答案B
解析 A项absorb是"吸收"的意思；B项extract意为"提取，提炼"，即英文的get from或take out；C项allude指的是在说话或文章中"提到，暗示"的意思，常与介词连用；而D项devour的意思是：to eat with great hunger(狼吞虎咽地吃东西)。根据句意，应选B。
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