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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
admin
2014-09-24
49
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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