However, by learning to get copper and tin by heating rocks and combining copper and tin to make an alloy called bronze, the technology of metallurgy began about 3500 B.C. with the Bronze Age. 这句话的意思是 然而,研究熔化矿石和制造铁合金(即铜合金)的冶金技术出现公元前 3500 年的青铜时代。
【简答题】你将听到五个句子。请在每小题所给的A、B、C三个选项中选出你所听到的单词或短语。 ( )1. A. weather ( )2. A. library ( )3. A. doing ( )4. A. two workers ( )5. A. the next B. with B. history B. boring B. work as B. the firs...
【简答题】你将听到五个句子。请在每小题所给的A?B?C三个选项中选出你所听到的单词。每个句子读两遍。 ( )1. A. there ( )2. A. run ( )3. A. pencil ( )4. A. uncle ( )5. A. boring B. where B. runner B. eraser B. girl B. interesting C. them...