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President Obama`s administration says it`s more concerned with what`s in coins than who`s on them. The penny in your pocket might look like copper, but copper actually makes up less than 3 percent of a one-cent coin. And the main metal in nickels ain
CNN2012年(二)月
The penny is costing the government a pretty penny these days. In fact, the US government lost over 50 million dollars last year in penny production. The culprit is the cost of the metal in the penny. However, contrary to common belief, the penny is
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1.Another round of snow in the winter that just won't quit. A storm bearing down on areas from Oklahoma to New York, expected to dump ice and up to a foot of snow in some places. 2.Ukrainian troops trapped in their own country. On Sunday, forces were
美联社新闻一分钟2014(三)月
Passage One 26. A. They were possibly caused by man. B. They were mostly caused by volcanoes. C. They were certainly caused by nature. D. We know nothing about their causes. 27. A. Afraid. B. Excited. C. Curious. D. Indifferent. 28. A. Copper and iro
英语四级听力-短对话
Metal, heal thyself 金属，自己愈合吧 Materials science: Researchers have devised an ingenious way for the damaged surfaces of metals to repair themselves when they come to harm 材料科学：研究人员构想出了一种新颖独特的方法，
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Zinc, which is used to galvanise steel, has emerged as the best-performing metal this year as supply cuts spur a recovery in sentiment. 锌成为今年表现最佳的金属，减产带动市场人气回升。这种金属被用来生产镀锌钢板。
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